DELL S2721HS User Manual

Dell S2421HS/S2721HS/S2421HSX/  
S2721HSX Monitor  
User’s Guide  
Model: S2421HS/S2721HS/S2421HSX/S2721HSX  
Regulatory model: S2421Ht/S2721Ht  
Contents  
Safety instructions. . . . . . . . . . . . . . . . . . . . . . . . . . 5  
About your monitor . . . . . . . . . . . . . . . . . . . . . . . . . 6  
Package contents . . . . . . . . . . . . . . . . . . . . . . 6  
Product features . . . . . . . . . . . . . . . . . . . . . . . 7  
Identifying parts and controls . . . . . . . . . . . . . . . . 8  
Front view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8  
Back view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9  
Bottom view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10  
Monitor specifications . . . . . . . . . . . . . . . . . . . 11  
Resolution specifications . . . . . . . . . . . . . . . . . . . . . . 12  
Preset display modes . . . . . . . . . . . . . . . . . . . . . . . . 12  
Electrical specifications. . . . . . . . . . . . . . . . . . . . . . . 13  
Physical characteristics. . . . . . . . . . . . . . . . . . . . . . . 13  
Environmental characteristics . . . . . . . . . . . . . . . . . . . 14  
Power management modes . . . . . . . . . . . . . . . . . . . . . 15  
Pin assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . 17  
Plug-and-play . . . . . . . . . . . . . . . . . . . . . . . 19  
LCD monitor quality and pixel policy . . . . . . . . . . . 19  
Ergonomics. . . . . . . . . . . . . . . . . . . . . . . . . 20  
Handling and moving your display. . . . . . . . . . . . . 22  
Maintenance guidelines . . . . . . . . . . . . . . . . . . 23  
Cleaning your monitor. . . . . . . . . . . . . . . . . . . . . . . . 23  
Setting up the monitor. . . . . . . . . . . . . . . . . . . . . . .24  
Connecting the stand . . . . . . . . . . . . . . . . . . . 24  
Using the tilt, swivel, and vertical extension . . . . . . . 26  
Contents  
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3
Tilt, Swivel and Vertical Extension . . . . . . . . . . . . . . . . . 26  
Rotating the Display . . . . . . . . . . . . . . . . . . . . 27  
Configuring the display settings on your computer after  
rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . 27  
Connecting your monitor . . . . . . . . . . . . . . . . . 28  
Organizing your cables. . . . . . . . . . . . . . . . . . . 29  
Securing your monitor using Kensington lock (optional) 29  
Removing the monitor stand . . . . . . . . . . . . . . . 30  
Wall mounting (Optional) . . . . . . . . . . . . . . . . . 31  
Operating the monitor . . . . . . . . . . . . . . . . . . . . . . 32  
Power on the monitor . . . . . . . . . . . . . . . . . . . 32  
Using the front panel controls. . . . . . . . . . . . . . . 32  
Using the OSD lock function . . . . . . . . . . . . . . . 34  
Front-panel button. . . . . . . . . . . . . . . . . . . . . 36  
Using the On-Screen Display (OSD) menu . . . . . . . . 37  
Accessing the menu system . . . . . . . . . . . . . . . . . . . . 37  
OSD warning messages . . . . . . . . . . . . . . . . . . . . . . . 48  
Setting the maximum resolution . . . . . . . . . . . . . . . . . . 50  
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51  
Self-test . . . . . . . . . . . . . . . . . . . . . . . . . . 51  
Built-in diagnostics . . . . . . . . . . . . . . . . . . . . 52  
Common problems . . . . . . . . . . . . . . . . . . . . . 53  
Product specific problems. . . . . . . . . . . . . . . . . 54  
Appendix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56  
FCC notices (U.S. only) and other regulatory information 56  
Contacting Dell. . . . . . . . . . . . . . . . . . . . . . . 56  
Outline dimension . . . . . . . . . . . . . . . . . . . . . . . . . .57  
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Contents  
Safety instructions  
CAUTION: Use of controls, adjustments, or procedures other than those  
specified in this documentation may result in exposure to shock, electrical  
hazards, and/or mechanical hazards.  
Place the monitor on a solid surface and handle it carefully. The screen is fragile  
and can be damaged if dropped or hit sharply.  
Always be sure that your monitor is electrically rated to operate with the AC  
power available in your location.  
Keep the monitor in room temperature. Excessive cold or hot conditions can have  
an adverse effect on the liquid crystal of the display.  
Do not subject the monitor to severe vibration or high impact conditions. For  
example, do not place the monitor inside a car trunk.  
Unplug the monitor when it is going to be left unused for an extended period of  
time.  
To avoid electric shock, do not attempt to remove any cover or touch the inside  
of the monitor.  
For information on safety instructions, see the Safety, Environmental, and Regulatory  
Information (SERI).  
Safety instructions  
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5
 
About your monitor  
Package contents  
Your monitor ships with the components shown below. Ensure that you have received  
all the components and see Contacting Dell if anything is missing.  
NOTE: Some components may be optional and may not ship with your  
monitor. Some features may not be available in certain countries.  
Display  
S2421HS/S2721HS  
S2421HSX/S2721HSX  
Stand riser  
S2421HS/S2721HS  
S2421HSX/S2721HSX Stand base  
Power cable (varies by country)  
HDMI cable  
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About your monitor  
Quick Setup Guide  
Safety,Environmental,and  
Regulatory Information  
Product features  
The Dell S2421HS/S2721HS/S2421HSX/S2721HSX monitor has an active matrix,  
Thin Film Transistor (TFT), Liquid Crystal Display (LCD), and LED backlight. The  
monitor features include:  
S2421HS/S2421HSX: 60.45 cm (23.8 in.) active area display (Measured  
diagonally). 1920 x 1080 (16:9) resolution, plus full-screen support for lower  
resolutions.  
S2721HS/S2721HSX: 68.6 cm (27 in.) active area display (Measured diagonally).  
1920 x 1080 (16:9) resolution, plus full-screen support for lower resolutions.  
Tilt, swivel, pivot and vertical extension adjustment capabilities.  
Removable pedestal and Video Electronics Standards Association (VESA™) 100  
mm mounting holes for flexible mounting solutions.  
Ultra-thin bezel minimizes the bezel gap in multi-monitor usage, enabling easier  
set up with an elegant viewing experience.  
Extensive digital connectivity with HDMI & DP helps future-proof your monitor.  
Plug and play capability if supported by your computer.  
On-Screen Display (OSD) adjustments for ease of set-up and screen  
optimization.  
Supports AMD FreeSync™ technology. AMD Freesync™ certified range from  
48HZ-75HZ.  
Power and OSD buttons lock.  
Security lock slot.  
0.3 W standby power when in the standby mode.  
Optimize eye comfort with a flicker-free screen.  
WARNING: The possible long-term effects of blue light emission from the  
monitor may cause damage to the eyes, including eye fatigue or digital eye  
strain. ComfortView feature is designed to reduce the amount of blue light  
emitted from the monitor to optimize eye comfort.  
About your monitor  
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7
Identifying parts and controls  
Front view  
1
2
S2421HS/S2721HS  
1
2
S2421HSX/S2721HSX  
Use  
Label Description  
1
2
Function buttons  
Power on/off button  
(with LED indicator)  
For more information, see Operating the Monitor  
To turn the monitor on or off.  
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About your monitor  
Back view  
1
2
3
5
4
S2421HS/S2721HS  
1
2
3
5
4
S2421HSX/S2721HSX  
Use  
Label Description  
1
VESA mounting holes (100 mm Wall mount monitor using VESA-compatible  
x 100 mm-behind attached  
VESA cover)  
wall mount kit (100 mm x 100 mm).  
2
3
4
Regulatory label  
Lists the regulatory approvals.  
Releases stand from monitor.  
Stand release button  
Barcode, serial number, and  
Service Tag label  
Refer to this label if you need to contact  
Dell for technical support. The Service Tag  
is a unique alphanumeric identifier that  
enables Dell service technicians to identify  
the hardware components in your display  
and access warranty information.  
5
Cable management slot  
Use to organize cables by placing them  
through the slot.  
About your monitor  
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9
Bottom view  
1 2  
3 4 5  
S2421HS/S2721HS  
1 2  
3 4 5  
S2421HSX/S2721HSX  
Label Description  
Use  
1
Security lock slot  
Secures monitor with security cable lock(sold  
separately).  
2
3
4
5
Power connector  
DisplayPort  
Connect the power cable (shipped with your  
monitor).  
Connect your computer with the DisplayPort  
cable (optional).  
HDMI port  
Connect your computer with the HDMI cable  
(shipped with your monitor).  
Audio line-out port  
Connect speakers to playback audio through  
HDMI or DisplayPort audio channels.  
Only two-channel audio is supported.  
NOTE: The audio line-out port does not support  
headphones.  
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About your monitor  
 
Monitor specifications  
Model  
S2421HS/S2421HSX  
S2721HS/S2721HSX  
Screen type  
Panel Type  
Aspect ratio  
Viewable image dimensions  
Diagonal  
Active matrix - TFT LCD  
In-plane switching technology  
16:9  
60.45 cm (23.8 in.)  
68.6 cm (27.0 in.)  
Active Area  
Horizontal  
527.04 mm (20.75 in.)  
296.46 mm (11.67 in.)  
597.89 mm (23.54 in.)  
336.31 mm (13.24 in.)  
Vertical  
Area  
156246.28 mm2 (242.15 in.2) 201073.02 mm2 (311.67 in.2)  
Pixel pitch  
0.2745 mm x 0.2745 mm  
92.56  
0.3114 mm x 0.3114 mm  
81.59  
Pixel per inch (PPI)  
Viewing angle  
Horizontal  
Vertical  
178° (typical)  
178° (typical)  
Brightness  
250 cd/m² (typical)  
300 cd/m² (typical)  
Contrast ratio  
1,000 to 1 (typical)  
Display screen coating  
Anti-glare treatment of the front polarizer (3H) hard  
coating  
Backlight  
LED edgelight system  
8 ms (normal)  
Response Time  
(Gray to Gray)  
5 ms (fast)  
4 ms (extreme)  
Color depth  
Color gamut*  
Connectivity  
16.7 million colors  
NTSC 72%  
1 x HDMI 1.4  
1 x DisplayPort 1.2  
1 x Audio line-out port (3.5 mm jack)  
Border width (edge of monitor to active area)  
Top/Left/Right  
Bottom  
5.4 mm  
6.0 mm  
20.7 mm  
21.3 mm  
Adjustability  
About your monitor  
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11  
Height adjustable stand 100 mm  
110mm  
Tilt  
-5° to 21°  
-30° to 30°  
-90° to 90°  
Yes  
Swivel  
Pivot  
Cable management  
Dell Display Manager  
(DDM)Compatibility  
Easy Arrange and other key features  
Security  
Security-lock slot (cable lock sold separately)  
*At panel native resolution only, under Custom Mode preset.  
Resolution specifications  
Model  
S2421HS/S2421HSX/S2721HS/S2721HSX  
DisplayPort  
HDMI  
Horizontal scan range  
Vertical scan range  
83 kHz to 83 kHz  
48 Hz to 75 Hz  
30 kHz to 83 kHz  
Maximum preset resolution 1920 x 1080 at 60 Hz  
Video display capabilities  
(HDMI & DP alternate  
mode)  
480i, 480p, 576i, 576p, 720p, 1080i, 1080p  
Preset display modes  
Display Mode  
Horizontal  
Frequency  
(kHz)  
Vertical  
Frequency  
(Hz)  
Pixel Clock  
(MHz)  
Sync  
Polarity  
(Horizontal/  
Vertical)  
-/+  
VGA, 720 x 400  
VGA, 640 x 480  
VESA, 640 x 480  
VESA, 800 x 600  
VESA, 800 x 600  
31.5  
31.5  
37.5  
37.9  
46.9  
70.0  
60.0  
75.0  
60.0  
75.0  
60.0  
75.0  
75.0  
60.0  
75.0  
28.3  
25.2  
31.5  
-/-  
-/-  
40.0  
49.5  
65.0  
78.8  
108.0  
108.0  
135.0  
+/+  
+/+  
-/-  
VESA, 1024 x 768 48.4  
VESA, 1024 x 768 60.0  
+/+  
+/+  
+/+  
+/+  
MAC, 1152 x 864  
67.5  
VESA, 1280 x 1024 64.0  
VESA, 1280 x 1024 80.0  
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About your monitor  
 
VESA, 1600 x 900 60.0  
60.0  
60.0  
75.0  
108.0  
148.5  
174.5  
+/+  
+/+  
+/-  
CVT, 1920 x 1080  
CVT, 1920 x 1080  
67.5  
83.89  
Electrical specifications  
Model  
S2421HS/S2421HSX/S2721HS/S2721HSX  
Video input signals  
Digital video signal for each differential line  
Per differential line at 100 ohm impedance  
DP/HDMI signal input support  
100-240 VAC / 50 or 60 Hz 3 Hz / 1.5 A  
(maximum)  
Input voltage/frequency/  
current  
Inrush current  
120 V: 30 A (maximum)  
240 V: 60 A (maximum)  
Physical characteristics  
Model  
S2421HS/S2421HSX  
S2721HS/S2721HSX  
Connector type  
1 x HDMI1.4 port  
1 x DisplayPort 1.2  
1 x Audio line-out port  
Signal cable type  
Dimensions (with stand)  
Height (extended)  
Height (compressed)  
Width  
1.8 m HDMI1.4 cable  
446.8 mm (17.59 in.)  
346.8 mm (13.65 in.)  
537.8 mm (21.17 in.)  
159.7 mm (6.29 in.)  
509.0 mm (20.04 in.)  
399.0 mm (15.71 in.)  
609.9 mm (24.01 in.)  
174.7 mm (6.88 in.)  
Depth  
Dimensions (without stand)  
Height  
322.6 mm (12.70 in.)  
537.8 mm (21.17 in.)  
53.8 mm (2.12 in.)  
363.6 mm (14.32 in.)  
609.9 mm (24.01 in.)  
54.0 mm (2.13 in.)  
Width  
Depth  
Stand dimensions  
Height (extended)  
Height (compressed)  
Width  
361.5 mm (14.23 in.)  
325.4 mm (12.81 in.)  
237.0 mm (9.33 in.)  
403.1 mm (15.87 in.)  
364.8 mm (14.36 in.)  
257.0 mm (10.12 in.)  
About your monitor  
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13  
Depth  
159.7 mm (6.29 in.)  
174.7 mm (6.88 in.)  
Weight  
Weight with packaging  
7.0 kg (15.43 lb)  
4.8 kg (10.58 lb)  
8.9 kg (19.62 lb)  
6.0 kg (13.23 lb)  
Weight with stand assembly  
and cables  
Weight without stand  
assembly (For wall mount or  
VESA mount considerations -  
no cables)  
3.2 kg (7.05 lb)  
4.3 kg (9.48 lb)  
Weight of stand assembly  
1.3 kg (2.87 lb)  
1.5 kg (3.31 lb)  
Environmental characteristics  
Compliant standards  
ENERGY STAR certified Monitor  
TCO Certified Display  
RoHS Compliant  
BFR/PVC Reduce monitor (excluding external cables)  
Arsenic-Free glass and Mercury-Free for the panel only  
Temperature  
Operating  
0°C to 40°C (32°F to 104°F)  
-20 °C to 60 °C (-4 °F to 140 °F)  
Non-operating  
Humidity  
Operating  
10% to 80% (non-condensing)  
5% to 90% (non-condensing)  
Non-operating  
Altitude  
Operating (maximum)  
Non-operating (maximum)  
Thermal dissipation  
S2421HS/S2421HSX  
5,000 m (16,404 ft)  
12,192 m (40,000 ft)  
78.48 BTU/hour (maximum)  
61.42 BTU/hour (typical)  
105.78 BTU/hour (maximum)  
68.24 BTU/hour (typical)  
S2721HS/S2721HSX  
Power management modes  
If you have VESA’s DPM-compliant video card or software installed in your PC, the  
monitor can automatically reduce its power consumption when not in use. This is  
referred to as standby mode1. If the computer detects input from the keyboard, mouse,  
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About your monitor  
 
or other input devices, the monitor automatically resumes functioning. The following  
table shows the power consumption and signaling of this automatic power saving  
feature.  
S2421HS/S2421HSX  
VESA  
Horizontal Vertical Video Power indicator Power  
modes  
sync  
sync  
consumption  
Normal  
operation  
Active  
Active  
Active White  
23 W (maximum)**  
18 W (typical)  
Active-off Inactive  
mode  
Inactive Off  
White  
(Glowing)  
Off  
Less than 0.3 W  
Switch off  
-
-
-
Less than 0.3 W  
Power Consumption PON  
11.04 W  
35.04 kWh  
Total Energy Consumption(TEC)  
S2721HS/S2721HSX  
VESA  
Horizontal Vertical Video Power indicator Power  
modes  
sync  
sync  
consumption  
31 W (maximum)**  
Normal  
Active  
Active  
Active White  
operation  
20 W (typical)  
Active-off Inactive  
mode  
Inactive Off  
White  
(Glowing)  
Off  
Less than 0.3 W  
Less than 0.3 W  
Switch off  
-
-
-
Power Consumption PON  
Total Energy Consumption(TEC)  
12.59 W  
40.14 kWh  
About your monitor  
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15  
The OSD operates only in the normal operation mode. If you press any button in the  
active-off mode, one of the following message is displayed.  
S2421HS/S2421HSX  
Dell 24 Monitor  
No DP signal from your device.  
Press any key on the keyboard or move the mouse to wake it up.  
If there is no display, press the monitor button again to select  
the correct input source.  
S2421HS/S2421HSX  
S2721HS/S2721HSX  
Dell 27 Monitor  
No DP signal from your device.  
Press any key on the keyboard or move the mouse to wake it up.  
If there is no display, press the monitor button again to select  
the correct input source.  
S2721HS/S2721HSX  
*Zero power consumption in OFF mode can only be achieved by disconnecting  
the AC mains cable from the monitor.  
**Maximum power consumption with maximum luminance  
This document is informational only and reflects laboratory performance. Your product  
may perform differently, depending on the software, components and peripherals  
you ordered and shall have no obligation to update such information. Accordingly, the  
customer should not rely upon this information in making decisions about electrical  
tolerances or otherwise. No warranty as to accuracy or completeness is expressed or  
implied.  
Activate the computer and the monitor to gain access to the OSD.  
NOTE: This monitor is ENERGY STAR certified.  
This product qualifies for ENERGY STAR in the factory default settings which can be  
restored by “Factory Reset” function in the OSD menu. Changing the factory default  
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About your monitor  
settings or enabling other features may increase power consumption that could exceed  
the ENERGY STAR specified limit.  
NOTE:  
Pon: Power consumption of On Mode as defined in Energy Star 8.0 version.  
TEC: Total energy consumption in kWh as defined in Energy Star 8.0 version.  
Pin assignments  
DisplayPort  
Pin  
20-pin side of  
Pin  
20-pin side of  
number the connected signal cable number the connected signal cable  
1
ML3 (n)  
GND  
11  
GND  
2
3
4
5
6
7
12  
13  
14  
15  
16  
17  
18  
19  
20  
ML0 (p)  
ML3 (p)  
ML2 (n)  
GND  
CONFIG1  
CONFIG2  
AUX CH (p)  
GND  
ML2 (p)  
ML1 (n)  
GND  
AUX CH (n)  
Hot Plug Detect  
Return  
8
9
10  
ML1 (p)  
ML0 (n)  
DP_PWR  
About your monitor  
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17  
HDMI port  
Pin number 19-pin side of the connected signal cable  
1
TMDS DATA 2+  
2
TMDS DATA 2 SHIELD  
TMDS DATA 2-  
3
4
TMDS DATA 1+  
5
TMDS DATA 1 SHIELD  
TMDS DATA 1-  
6
7
TMDS DATA 0+  
8
TMDS DATA 0 SHIELD  
TMDS DATA 0-  
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
TMDS CLOCK+  
TMDS CLOCK SHIELD  
TMDS CLOCK-  
CEC  
Reserved (N.C. on device)  
DDC CLOCK (SCL)  
DDC DATA (SDA)  
DDC/CEC Ground  
+5 V POWER  
HOT PLUG DETECT  
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About your monitor  
Plug-and-play  
You can install the monitor in any Plug-and-Play-compatible system. The monitor  
automatically provides the computer system with its extended display identification  
data (EDID) using display data channel (DDC) protocols so that the computer can  
configure itself and optimize the monitor settings. Most monitor installations are  
automatic; you can select different settings if desired. For more information about  
changing the monitor settings, see Operating the monitor.  
LCD monitor quality and pixel policy  
During the LCD monitor manufacturing process, it is not uncommon for one or more  
pixels to become fixed in an unchanging state which are hard to see and do not affect  
the display quality or usability. For more information on LCD Monitor Pixel Policy, see  
Dell support site at: https://www.dell.com/pixelguidelines.  
About your monitor  
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19  
Ergonomics  
CAUTION: Improper or prolonged usage of keyboard may result in injury.  
CAUTION: Viewing the monitor screen for extended periods of time may  
result in eye strain.  
For comfort and efficiency, observe the following guidelines when setting up and using  
your computer workstation:  
Position your computer so that the monitor and keyboard are directly in front of  
you as you work. Special shelves are commercially available to help you correctly  
position your keyboard.  
To reduce the risk of eye strain and neck/arm/back/shoulder pain from using the  
monitor for long periods of time, we suggest you to:  
1. Set the distance of the screen between 20 to 28 in. (50 - 70 cm) from your  
eyes.  
2. Blink frequently to moisten your eyes or wet your eyes with water after  
prolonged usage of the monitor.  
3. Take regular and frequent breaks for 20 minutes every two hours.  
4. Look away from your monitor and gaze at a distant object at 20 feet away for  
at least 20 seconds during the breaks.  
5. Perform stretches to relieve tension in the neck, arm, back, and shoulders  
during the breaks.  
Make sure that the monitor screen is at eye level or slightly lower when you are  
sitting in front of the monitor.  
Adjust the tilt of the monitor, its contrast, and brightness settings.  
Adjust the ambient lighting around you (such as overhead lights, desk lamps, and  
the curtains or blinds on nearby windows) to minimize reflections and glare on the  
monitor screen.  
Use a chair that provides good lower-back support.  
Keep your forearms horizontal with your wrists in a neutral, comfortable position  
while using the keyboard or mouse.  
Always leave space to rest your hands while using the keyboard or mouse.  
Let your upper arms rest naturally on both sides.  
Ensure that your feet are resting flat on the floor.  
When sitting, make sure that the weight of your legs is on your feet and not  
on the front portion of your seat. Adjust your chair’s height or use a footrest if  
necessary to maintain a proper posture.  
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About your monitor  
 
Vary your work activities. Try to organize your work so that you do not have to sit  
and work for extended periods of time. Try to stand or get up and walk around at  
regular intervals.  
Keep the area under your desk clear of obstructions and cables or power cords  
that may interfere with comfortable seating or present a potential trip hazard.  
monitor screen at or  
below eye level  
monitor and  
keyboard  
positioned  
directly in front  
of the user  
wrists relaxed  
and at  
feet at on the  
oor  
About your monitor  
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21  
Handling and moving your display  
To ensure the monitor is handled safely when lifting or moving it, follow the guidelines  
mentioned below:  
Before moving or lifting the monitor, turn off your computer and the monitor.  
Disconnect all cables from the monitor.  
Place the monitor in the original box with the original packing materials.  
Hold the bottom edge and the side of the monitor firmly without applying  
excessive pressure when lifting or moving the monitor.  
When lifting or moving the monitor, ensure the screen is facing away from you  
and do not press on the display area to avoid any scratches or damage.  
When transporting the monitor, avoid any sudden shock or vibration to it.  
22  
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About your monitor  
When lifting or moving the monitor, do not turn the monitor upside down while  
holding the stand base or stand riser. This may result in accidental damage to the  
monitor or cause personal injury.  
Maintenance guidelines  
Cleaning your monitor  
CAUTION: Read and follow the Safety instructions before cleaning the  
monitor.  
WARNING: Before cleaning the monitor, unplug the monitor power cable  
from the electrical outlet.  
For best practices, follow the instructions in the list below when unpacking, cleaning,  
or handling your monitor:  
To clean your anti-static screen, lightly dampen a soft, clean cloth with water. If  
possible, use a special screen-cleaning tissue or solution suitable for the anti-  
static coating. Do not use benzene, thinner, ammonia, abrasive cleaners, or  
compressed air.  
Use a lightly-dampened, warm cloth to clean the monitor. Avoid using detergent  
of any kind as some detergents leave a milky film on the monitor.  
If you notice white powder when you unpack your monitor, wipe it off with a  
cloth.  
Handle your monitor with care as a darker-colored monitor may get scratched  
and show white scuff marks more than a lighter-colored monitor.  
To help maintain the best image quality on your monitor, use a dynamically  
changing screen saver and turn off your monitor when not in use.  
About your monitor  
|
23  
Setting up the monitor  
Connecting the stand  
NOTE: The stand riser and stand base are detached when the monitor is  
shipped from the factory.  
NOTE: The following instructions are applicable only for the stand that  
was shipped with your monitor. If you are connecting a stand that you  
purchased from any other source, follow the set up instructions that were  
included with the stand.  
CAUTION: Place monitor of a flat, clean, and soft surface to avoid  
scratching the display panel.  
To attach the monitor stand:  
1. Align the tabs on the stand base with the slots on the stand riser.  
2. Insert the stand riser on the stand base firmly.  
3. Open the screw handle at the bottom of the stand base, and rotate it clockwise  
to tighten the screw firmly. Then close the screw handle.  
24  
|
Setting up the monitor  
4. Slide the tabs on the stand riser into the slots on the display back cover and press  
down the stand assembly to snap it into place.  
CAUTION: Hold the stand riser firmly when lifting the monitor to avoid any  
accidental damage.  
5. Hold the stand riser and lift the monitor carefully, then place it on a flat surface.  
Setting up the monitor  
|
25  
Using the tilt, swivel, and vertical extension  
Note: The following instructions are applicable only for the stand that  
was shipped with your monitor. If you are connecting a stand that you  
purchased from any other source, follow the set up instructions that were  
included with the stand.  
Tilt, Swivel and Vertical Extension  
With the stand attached to the monitor, you can tilt the monitor for the most  
comfortable viewing angle.  
5°  
30°  
30°  
100 mm  
21°  
S2421HS/S2421HSX  
5°  
30°  
30°  
110 mm  
21°  
S2721HS/S2721HSX  
NOTE: The stand is detached when the monitor is shipped from the  
factory.  
26  
|
Setting up the monitor  
Rotating the Display  
Before you rotate the display, extend the display vertically until the top of the stand  
riser and then tilt the display backwards until the maximum to avoid hitting the bottom  
edge of the display.  
90°  
NOTE: To toggle the display setting on your Dell computer between  
landscape and portrait when rotating the display, download and install the  
latest graphics driver. To download, go to www.dell.com/support/drivers  
and search for the appropriate driver.  
NOTE: When the display is in portrait mode, you may experience  
performance degradation when using graphic-intensive applications such  
as 3D gaming.  
Configuring the display settings on your computer after rotation  
After you have rotated the display, complete the procedure given below to configure  
the display settings on your computer.  
NOTE: If you are using the monitor with a non-Dell computer, go to the  
graphics card manufacturer’s website or your computer manufacturer  
website for information on how to rotate the contents of your display.  
To configure the Display Settings:  
1. Right-click on the Desktop and click Properties.  
2. Select the Settings tab and click Advanced.  
3. If you have an AMD graphics card, select the Rotation tab and set the preferred  
rotation.  
4. If you have an nVidia graphics card, click the nVidia tab, in the left-hand column  
select NVRotate, and then select the preferred rotation.  
5. If you have an Intel® graphics card, select the Intel graphics tab, click Graphic  
Properties, select the Rotation tab, and then set the preferred rotation.  
Setting up the monitor  
|
27  
NOTE: If you do not see the rotation option or it is not working correctly,  
go to www.dell.com/support and download the latest driver for your  
graphics card.  
Connecting your monitor  
WARNING: Before you begin any of the procedures in this section, follow the  
To connect your monitor to the computer:  
1. Turn off your computer.  
2. Connect the DisplayPort or HDMI cable from your monitor to the computer.  
3. Turn on your monitor.  
4. Select the correct input source from the OSD Menu on your monitor and then  
turn on your computer.  
Connecting the HDMI cable  
HDMI  
HDMI  
Connecting the DP cable (Optional)  
DP  
DP  
28  
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Setting up the monitor  
 
Organizing your cables  
After connecting all necessary cables to your monitor and computer, (see Connecting  
Your Monitor for cable attachment) organize all cables as shown above.  
Securing your monitor using Kensington lock (optional)  
The security lock slot is located at the bottom of the monitor. (See Security lock slot)  
For more information on using the Kensington lock (purchased separately), see the  
documentation that is shipped with the lock.  
Secure your monitor to a table using the Kensington security lock.  
NOTE: The image is for the purpose of illustration only. Appearance of the  
lock may vary.  
Setting up the monitor  
|
29  
Removing the monitor stand  
CAUTION: To prevent scratches on the LCD screen while removing the  
stand, make sure that the monitor is placed on a soft, clean surface.  
NOTE: The following instructions are applicable only for the stand that  
was shipped with your monitor. If you are connecting a stand that you  
purchased from any other source, follow the set up instructions that were  
included with the stand.  
To remove the stand:  
1. Place a flat cushion or a sitting mat near the edge of a table and place the  
monitor on it with the display facing down.  
2. Press and hold the stand-release button.  
3. Lift the stand up and away from the monitor.  
30  
|
Setting up the monitor  
Wall mounting (Optional)  
NOTE: Use M4 x 10 mm screws to secure the wall-mounting kit to the  
monitor.  
See the documentation that is shipped with the VESA-compatible wall mounting kit.  
1. Place a flat cushion or a sitting mat near the edge of a table and place the  
monitor on it with the display facing down.  
2. Remove the stand.  
3. Using a Phillips crosshead screwdriver, remove the four screws that secure the  
back panel.  
4. Connect the mounting bracket from the wall mounting kit to the monitor.  
5. Follow the instructions that shipped with the wall-mounting kit and mount the  
monitor on the wall.  
NOTE: For use only with UL or CSA or GS-listed wall mount bracket  
with minimum weight/load bearing capacity of 12.8 kg (S2421HS/  
S2421HSX)/17.2 kg (S2721HS/S2721HSX).  
Setting up the monitor  
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31  
Operating the monitor  
Power on the monitor  
Press the  
button to turn on the monitor.  
Using the front panel controls  
Use the control buttons at the bottom edge of the monitor to adjust the specifications  
of the image being displayed. When using the control buttons, an On-Screen Display  
(OSD) menu appears on the screen with numeric values.  
1
2
3 4  
5
32  
|
Operating the monitor  
 
The following table describes the front panel buttons:  
Front-Panel Button  
1
Description  
Use this button to choose from a list of preset  
color modes.  
Shortcut key:  
Preset Modes  
2
Use this button to choose from a list of input  
sources.  
Shortcut key:  
Input source  
3
Use this menu button to launch the on-screen  
display (OSD) and select the OSD menu.  
Menu  
4
Use this button to go back to the main menu or exit  
the OSD main menu.  
Exit  
5
Use the Power button to turn the monitor On and  
Off.  
The white LED indicates the monitor is On and fully  
functional.  
Power(with power light  
indicator)  
Une LED blanche respirante indique le mode de  
veille DPMS.  
Operating the monitor  
|
33  
Using the OSD lock function  
You can lock the front-panel control buttons to prevent access to the OSD menu and/  
or power button.  
Use the Lock menu to lock the button(s).  
1. Select one of the following options.  
Dell 24/27 Monitor  
Brightness/Contrast  
Input Source  
Color  
Language  
Transparency  
Timer  
Menu Buttons  
Power Button  
Display  
Lock  
Menu  
Reset Menu  
Personalize  
Menu  
+
Power Buttons  
Others  
Disable  
2. The following message appears.  
Dell 24/27 Monitor  
Are you sure you want to lock the Menu Buttons  
?
To unlock the Buttons, refer to the User’s Guide.  
Yes  
No  
S2421HS/S2721HS/S2421HSX/S2721HSX  
3. Select Yes to lock the buttons. Once locked, pressing any control button will  
display the lock icon  
Use the front-panel control button to lock the button(s).  
1
2
3
4
5
34  
|
Operating the monitor  
1. Press and hold Button 4 for four seconds, a menu appears on the screen.  
Dell 24/27 Monitor  
Select Option:  
2. Select one of the following options:  
Options  
1
Description  
Select this option to lock OSD menu function.  
Menu Buttons lock  
2
3
Use this option to lock power button. This will  
prevent the user to turn off the monitor using the  
power button.  
Power Button lock  
Use this option to lock OSD menu and power  
button to turn off the monitor.  
Menu and Power Buttons  
lock  
4
Use this option to run the built-in diagnostics, see  
Built-in Diagnostics  
To unlock the button(s).  
Press and hold Button 4 for four seconds until a menu appears on the screen. The  
following table describes the options to unlock the front-panel control buttons.  
Dell 24/27 Monitor  
Dell 24/27 Monitor  
Dell 24/27 Monitor  
Select Option:  
Select Option:  
Select Option:  
Operating the monitor  
|
35  
Options  
Description  
1
Use this option to unlock OSD menu function.  
Menu Buttons unlock  
2
3
Use this option to unlock power button to turn off  
the monitor.  
Power Button unlock  
Use this option to unlock OSD menu and power  
button to turn off the monitor.  
Menu and Power Buttons  
unlock  
4
Use this option to run the built-in diagnostics, see  
Built-in Diagnostics  
Front-panel button  
Use the buttons on the front of the monitor to adjust the image settings.  
1
2
3
Front Panel Button  
1
Description  
Use the Up (increase) and Down (decrease) buttons to  
adjust items in the OSD menu.  
Up  
Down  
2
Use the OK button to confirm your selection.  
OK  
36  
|
Operating the monitor  
3
Use the Back button to go back to the previous menu.  
Back  
Using the On-Screen Display (OSD) menu  
Accessing the menu system  
NOTE: The changes you make using the OSD menu are automatically saved  
when you move to another OSD menu, when you exit the OSD menu, or  
when the OSD menu to disappears automatically.  
1. Press the  
button to launch the OSD menu and display the main menu.  
Dell 24/27 Monitor  
Brightness/Contrast  
Input Source  
Color  
75%  
75%  
Display  
Menu  
Personalize  
Others  
2. Press the  
and  
buttons to move between options. As you move from one  
icon to another, the option name is highlighted.  
3. Press the  
4. Press the  
5. Press  
or  
or  
buttons to select the desired parameter.  
or button, according to  
button once to activate the highlighted option.  
and  
to enter the slide bar and then use the  
the indicators on the menu, to make your changes.  
6. Select the  
menu.  
to return to previous menu or  
to accept and return to previous  
Operating the monitor  
|
37  
   
Icon Menu and  
Submenus  
Description  
Brightness/  
Contrast  
Use this menu to activate Brightness/Contrast  
adjustment.  
Dell 24/27 Monitor  
Brightness/Contrast  
Input Source  
Color  
75%  
Display  
Menu  
Personalize  
75%  
Others  
Brightness  
Contrast  
Brightness adjusts the luminance of the backlight  
(minimum 0; maximum 100).  
Press the  
Press the  
button to increase brightness.  
button to decrease brightness.  
Adjust the Brightness first, and then adjust Contrast only  
if further adjustment is necessary.  
Press the  
button to increase contrast and press the  
button to decrease contrast (between 0 and 100).  
Contrast adjusts the difference between darkness and  
lightness on the monitor.  
38  
|
Operating the monitor  
Icon Menu and  
Submenus  
Description  
Input Source Use the Input Source menu to select between different  
video inputs that are be connected to your monitor.  
Dell 24/27 Monitor  
Brightness/Contrast  
Input Source  
Color  
DP  
HDMI  
Auto select  
Reset Input Source  
On  
Display  
Menu  
Personalize  
Others  
DP  
Use  
Use  
to select the DP input source.  
HDMI  
to select the HDMI input source.  
Auto Select  
Use  
to select Auto Select to scan for available input  
signals.  
Reset Input Resets your monitor’s Input Source settings to the factory  
Source  
defaults.  
Color  
Use the Color menu to adjust the color setting mode.  
Dell 24/27 Monitor  
Brightness/Contrast  
Input Source  
Color  
Preset Modes  
Input Color Format  
Reset Color  
Standard  
RGB  
Display  
Menu  
Personalize  
Others  
Operating the monitor  
|
39  
 
Icon Menu and  
Submenus  
Description  
Preset  
Modes  
When you select Preset Modes, you can choose Standard,  
ComfortView, Movie, FPS, RTS, RPG, Warm, Cool, or  
Custom Color from the list.  
Dell 24/27 Monitor  
Brightness/Contrast  
Input Source  
Color  
Preset Modes  
Input Color Format  
Reset Color  
Standard  
ComfortView  
Movie  
FPS  
Display  
RTS  
Menu  
Personalize  
RPG  
Others  
Warm  
Cool  
Custom Color  
Standard: Default color settings. This is the default preset  
mode.  
ComfortView: Decreases the level of blue light emitted  
from the screen to make viewing more comfortable for your  
eyes.  
WARNING: The possible long-term effects of blue  
light emission from the monitor may cause personal  
injury such as digital eye strain, eye fatigue and  
damage to the eyes. Using monitor for extended  
periods of time may also cause pain in parts of body  
such as neck, arm, back and shoulder. For more  
information, see Ergonomics.  
Movie: Loads color settings ideal for movies.  
FPS: Loads color settings ideal for First-Person Shooter  
games.  
RTS: Loads color settings ideal for Real-Time Strategy  
games.  
RPG: Loads color settings ideal for Role-Playing games.  
Warm: Increases the color temperature. The screen  
appears warmer with a red/yellow tint.  
Cool: Decreases the color temperature. The screen appears  
cooler with a blue tint.  
40  
|
Operating the monitor  
Icon Menu and  
Submenus  
Description  
Custom Color: Allows you to manually adjust the color  
settings. Press the  
and  
buttons to adjust the Red,  
Green, and Blue values and create your own preset color  
mode.  
Input Color Allows you to set the video input mode to:  
Format  
RGB: Select this option if your monitor is connected to a  
computer (or DVD player) using the HDMI, DP cable.  
YPbPr: Select this option if your DVD player supports only  
YPbPr output.  
Dell 24/27 Monitor  
Preset Modes  
Input Color Format  
Reset Color  
Brightness/Contrast  
Input Source  
Color  
RGB  
YPbPr  
Display  
Menu  
Personalize  
Others  
Hue  
Use  
or  
to adjust the hue from 0 to 100.  
NOTE: Hue adjustment is available only for Movie and FPS,  
RTS, RPG mode.  
Saturation  
Use  
or  
to adjust the saturation from 0 to 100.  
NOTE: Saturation adjustment is available only for Movie and  
FPS, RTS, RPG mode.  
Reset Color Resets your monitor’s color settings to the factory defaults.  
Operating the monitor  
|
41  
Icon Menu and  
Submenus  
Description  
Display  
Use the Display menu to adjust image.  
Dell 24/27 Monitor  
Brightness/Contrast  
Input Source  
Color  
Aspect Ratio  
Sharpness  
Wide 16:9  
50  
Response Time  
Reset Display  
Normal  
Display  
Menu  
Personalize  
Others  
Aspect Ratio Select the image ratio between 16:9(Wide), 4:3 and 5:4.  
Sharpness  
Makes the image look sharper or softer.  
Use or to adjust the sharpness from ‘0’ to ‘100.  
Response  
Time  
Allows you to set the Response Time to Normal, Fast or  
Extreme.  
Reset  
Restores the display settings to factory defaults.  
Display  
42  
|
Operating the monitor  
Icon Menu and  
Submenus  
Description  
Menu  
Select this option to adjust the settings of the OSD, such  
as the languages of the OSD, the amount of time the menu  
remains on screen, and so on.  
Dell 24/27 Monitor  
Brightness/Contrast  
Input Source  
Color  
Language  
Transparency  
Timer  
English  
20  
20s  
Display  
Lock  
Disable  
Reset Menu  
Menu  
Personalize  
Others  
Language  
Set the OSD display to one of eight languages.  
(English, Spanish, French, German, Brazilian Portuguese,  
Russian, Simplified Chinese, or Japanese).  
Transparency Select this option to change the menu transparency by using  
and (min. 0 / max. 100).  
Timer  
OSD Hold Time: Sets the length of time the OSD remains  
active after you press a button.  
Use the  
and  
buttons to adjust the slider in 1-second  
increments, from 5 to 60 seconds.  
Operating the monitor  
|
43  
Icon Menu and  
Submenus  
Description  
Lock  
Controls user access to adjustments. The buttons are locked.  
Dell 24/27 Monitor  
Brightness/Contrast  
Input Source  
Color  
Language  
Transparency  
Timer  
Menu Buttons  
Power Button  
Display  
Lock  
Menu  
Reset Menu  
Personalize  
Menu  
+
Power Buttons  
Others  
Disable  
Menu Buttons: Through OSD to lock the Menu buttons.  
Power Button: Through OSD to lock the Power button.  
Menu + Power Buttons: Through OSD to lock the all of  
Menu and Power buttons.  
Disable: Press and hold the  
button next to the power  
button for four seconds to unlock the buttons.  
Reset Menu Restore the menu settings to factory defaults.  
44  
|
Operating the monitor  
Icon Menu and  
Submenus  
Description  
Personalize  
Dell 24/27 Monitor  
Brightness/Contrast  
Input Source  
Color  
Shortcut Key  
Shortcut Key  
1
Preset Modes  
Input Source  
On In On Mode  
2
Power Button LED  
Reset Personalization  
Display  
Menu  
Personalize  
Others  
Shortcut  
key 1  
Select from Preset Modes, Brightness/Contrast, Input  
Source, Aspect Ratio set as shortcut key 1.  
Shortcut  
key 2  
Select from Preset Modes, Brightness/Contrast, Input  
Source, Aspect Ratio set as shortcut key 2.  
Power  
Allows you to set the state of the power light to save energy.  
Button LED  
Reset  
Restores shortcut keys to factory defaults.  
Persona-  
lization  
Operating the monitor  
|
45  
Icon Menu and  
Submenus  
Description  
Others  
Select this option to adjust the OSD settings, such as the  
DDC/CI, LCD conditioning, and so on.  
Dell 24/27 Monitor  
Brightness/Contrast  
Input Source  
Color  
Display Info  
DDC/CI  
On  
Oꢀ  
LCD Conditioning  
Firmware  
Display  
00X000  
ABCDEFG  
Menu  
Service Tag  
Personalize  
Reset Others  
ENERGY STAR  
Factory Reset  
Others  
Display Info Displays the monitor’s current settings.  
DDC/CI DDC/CI (Display Data Channel/Command Interface) allows  
you to adjust the monitor settings using software on your  
computer.  
Select Off to turn off this feature.  
Enable this feature for best user experience and optimum  
performance of your monitor.  
Dell 24/27 Monitor  
Brightness/Contrast  
Input Source  
Color  
Display Info  
DDC/CI  
On  
Oꢀ  
LCD Conditioning  
Firmware  
Display  
Menu  
Service Tag  
Personalize  
Reset Others  
Factory Reset  
Others  
46  
|
Operating the monitor  
Icon Menu and  
Submenus  
Description  
LCD  
Helps reduce minor cases of image retention. Depending on  
Conditioning the degree of image retention, the program may take some  
time to run. Select On to start the process.  
Dell 24/27 Monitor  
Brightness/Contrast  
Input Source  
Color  
Display Info  
DDC/CI  
LCD Conditioning  
Firmware  
On  
Oꢀ  
Display  
Menu  
Service Tag  
Personalize  
Reset Others  
Factory Reset  
Others  
Firmware  
Displays the firmware version of your monitor.  
Service Tag Displays the Service Tag. The Service Tag is a unique  
alphanumeric identifier that allows Dell to identify the  
product specifications and access warranty information.  
NOTE: The Service Tag is also printed on a label located at  
the back of the cover.  
Reset  
Restores other settings, such as DDC/CI, to factory defaults.  
Others  
Factory  
Reset  
Restores all preset values to the factory default settings.  
These are also the setting for ENERGY STAR® tests.  
Dell 24/27 Monitor  
Brightness/Contrast  
Input Source  
Color  
Display Info  
DDC/CI  
On  
Oꢀ  
LCD Conditioning  
Firmware  
Display  
00X000  
ABCDEFG  
Menu  
Service Tag  
Personalize  
Reset Others  
ENERGY STAR  
Factory Reset  
Others  
Operating the monitor  
|
47  
OSD warning messages  
When the monitor does not support a particular resolution mode, you can see the  
following message:  
S2421HS/S2421HSX  
S2721HS/S2721HSX  
Dell 24 Monitor  
Dell 27 Monitor  
The current input timing is not supported by the monitor display. Please  
change your input timing to 1920x1080, 60Hz or any other monitor  
listed timing as per the monitor specifications.  
The current input timing is not supported by the monitor display. Please  
change your input timing to 1920x1080, 60Hz or any other monitor  
listed timing as per the monitor specifications.  
S2421HS/S2421HSX  
S2721HS/S2721HSX  
This means that the monitor cannot synchronize with the signal that it is receiving  
from the computer. See Resolution Specifications for the Horizontal and Vertical  
frequency ranges addressable by this monitor. Recommended mode is 1920 x 1080.  
You can see the following message before the DDC/CI function is disabled:  
S2421HS/S2421HSX  
S2721HS/S2721HSX  
Dell 24 Monitor  
Dell 27 Monitor  
The function of adjusting display setting using PC  
application will be disabled.  
The function of adjusting display setting using PC  
application will be disabled.  
Do you wish to disable DDC/CI function?  
Do you wish to disable DDC/CI function?  
Yes  
No  
Yes  
No  
S2421HS/S2421HSX  
S2721HS/S2721HSX  
When the monitor enters the Standby mode, the following message appears:  
S2421HS/S2421HSX  
S2721HS/S2721HSX  
Dell 24 Monitor  
Dell 27 Monitor  
Going into Standby mode…  
Going into Standby mode…  
S2421HS/S2421HSX  
S2721HS/S2721HSX  
Activate the computer and wake up the monitor to gain access to the OSD.  
If you press any button other than the power button, the following messages will  
appear depending on the selected input:  
48  
|
Operating the monitor  
S2421HS/S2421HSX  
S2721HS/S2721HSX  
Dell 24 Monitor  
Dell 27 Monitor  
No DP signal from your device.  
No DP signal from your device.  
Press any key on the keyboard or move the mouse to wake it up.  
Press any key on the keyboard or move the mouse to wake it up.  
If there is no display, press the monitor button again to select  
the correct input source.  
If there is no display, press the monitor button again to select  
the correct input source.  
S2421HS/S2421HSX  
S2721HS/S2721HSX  
If either DP, HDMI input is selected and the corresponding cable is not connected, a  
floating dialog box as shown below appears.  
S2421HS/S2421HSX  
S2721HS/S2721HSX  
Dell 24 Monitor  
Dell 27 Monitor  
No DP Cable  
No DP Cable  
The display will go into Standby mode in 4 minutes.  
The display will go into Standby mode in 4 minutes.  
www.dell.com/S2421HS  
www.dell.com/S2421HSX  
www.dell.com/S2721HS  
www.dell.com/S2721HSX  
S2421HS/S2421HSX  
S2721HS/S2721HSX  
or  
or  
Dell 24 Monitor  
Dell 27 Monitor  
No HDMI Cable  
No HDMI Cable  
The display will go into Standby mode in 4 minutes.  
The display will go into Standby mode in 4 minutes.  
www.dell.com/S2421HS  
www.dell.com/S2421HSX  
www.dell.com/S2721HS  
www.dell.com/S2721HSX  
S2421HS/S2421HSX  
S2721HS/S2721HSX  
See Troubleshooting for more information.  
Operating the monitor  
|
49  
Setting the maximum resolution  
To set the maximum resolution for the monitor:  
In Windows 7, Windows 8 or Windows 8.1:  
1. For Windows 8 or Windows 8.1 only, select the Desktop tile to switch to classic  
desktop. For Windows Vista and Windows 7, skip this step.  
2. Right-click on the desktop and click Screen Resolution.  
3. Click the Dropdown list of the Screen Resolution and select 1920 x 1080.  
4. Click OK.  
In Windows 10:  
1. Right-click on the desktop and click Display Settings.  
2. Click Advanced display settings.  
3. Click the dropdown list of Resolution and select 1920 x 1080.  
4. Click Apply.  
If you do not see the 1920 x 1080 as an option, you may need to update your graphics  
driver. Depending on your computer, complete one of the following procedures:  
If you have a Dell desktop or portable computer:  
Go to https://www.dell.com/support, enter your service tag, and download the  
latest driver for your graphics card.  
If you are using a non-Dell computer (laptop or desktop):  
Go to your computer manufacturer’s support website and download the latest  
graphic drivers.  
Go to your graphics card manufacturer’s website and download the latest graphic  
drivers.  
50  
|
Operating the monitor  
Troubleshooting  
WARNING: Before you begin any of the procedures in this section, follow  
Self-test  
Your monitor provides a self-test feature that allows you to check whether your  
monitor is functioning properly. If your monitor and computer are properly connected  
but the monitor screen remains dark, run the monitor self-test by performing the  
following steps:  
1. Turn off both your computer and the monitor.  
2. Unplug the video cable from the back of the computer. To ensure proper Self-Test  
operation, remove all video cables from the back of computer.  
3. Turn on the monitor.  
The floating dialog box should appear on-screen (against a black background), if the  
monitor cannot sense a video signal and is working correctly. While in self-test mode,  
the power LED remains white. Also, depending upon the selected input, one of the  
dialogs shown below will continuously scroll through the screen.  
S2421HS/S2421HSX  
S2721HS/S2721HSX  
Dell 24 Monitor  
Dell 27 Monitor  
No DP Cable  
No DP Cable  
The display will go into Standby mode in 4 minutes.  
The display will go into Standby mode in 4 minutes.  
www.dell.com/S2421HS  
www.dell.com/S2421HSX  
www.dell.com/S2721HS  
www.dell.com/S2721HSX  
S2421HS/S2421HSX  
S2721HS/S2721HSX  
or  
or  
Dell 24 Monitor  
Dell 27 Monitor  
No HDMI Cable  
No HDMI Cable  
The display will go into Standby mode in 4 minutes.  
The display will go into Standby mode in 4 minutes.  
www.dell.com/S2421HS  
www.dell.com/S2421HSX  
www.dell.com/S2721HS  
www.dell.com/S2721HSX  
S2421HS/S2421HSX  
S2721HS/S2721HSX  
4. This box also appears during normal system operation if the video cable is  
disconnected or damaged.  
5. Turn off your monitor and reconnect the video cable; then turn on both your  
computer and the monitor.  
Troubleshooting  
|
51  
 
If your monitor screen remains blank after you use the previous procedure, check your  
video controller and computer, because your monitor is functioning properly.  
Built-in diagnostics  
Your monitor has a built-in diagnostic tool that helps you determine if the screen  
abnormality you are experiencing is an inherent problem with your monitor, or with your  
computer and video card.  
1
2
3
4
5
To run the built-in diagnostics:  
1. Ensure that the screen is clean (no dust particles on the surface of the screen).  
2. Press and hold Button 4 for four seconds, a menu appears on the screen.  
3. Select the built-in diagnostics  
option. A gray screen appears.  
4. Carefully inspect the screen for abnormalities.  
5. Press Button 1 on the front panel again. The color of the screen changes to red.  
6. Inspect the display for any abnormalities.  
7. Repeat steps 5 and 6 to inspect the display when it changes to green, blue, black,  
white, and text screens.  
The test is complete when the text screen appears. To exit, press Button 1 again.  
If you do not detect any screen abnormalities during the built-in diagnostic tool, the  
monitor is functioning properly. Check the video card and computer.  
52  
|
Troubleshooting  
 
Common problems  
The following table contains general information about common monitor problems you  
might encounter and the possible solutions:  
Common  
What You  
Possible Solutions  
Symptoms  
Experience  
No Video/  
Power LED off  
No picture  
Ensure that the video cable connecting the  
monitor and the computer is properly connected  
and secure.  
Verify that the power outlet is functioning  
properly using any other electrical equipment.  
Ensure that the power button is depressed fully.  
Ensure that the correct input source is selected  
in the Input Source menu.  
No Video/  
No picture or no Increase brightness & contrast controls through  
Power LED on brightness  
OSD.  
Perform monitor self-test feature check.  
Check for bent or broken pins in the video cable  
connector.  
Run the built-in diagnostics.  
Ensure that the correct input source is selected  
in the Input Source menu.  
Missing Pixels  
LCD screen has • Cycle power on-off.  
spots  
• Pixel that is permanently off is a natural defect  
that can occur in LCD technology.  
• For more information on Dell Monitor Quality  
and Pixel Policy, see Dell Support site at:  
Stuck-on Pixels LCD screen has • Cycle power on-off.  
bright spots • Pixel that is permanently off is a natural defect  
that can occur in LCD technology.  
• For more information on Dell Monitor Quality  
and PixelPolicy, see Dell Support site at:  
Brightness  
Problems  
Picture too dim Reset the monitor to factory settings.  
or too bright  
Adjust brightness and contrast controls through  
OSD.  
Safety Related Visible signs of Do not perform any troubleshooting steps.  
Issues smoke or sparks Contact Dell immediately.  
Troubleshooting  
|
53  
Common  
What You  
Possible Solutions  
Symptoms  
Experience  
Intermittent  
Problems  
Monitor  
Ensure that the video cable connecting the  
malfunctions on monitor to the computer is connected properly  
& off  
and is secure.  
• Reset the monitor to factory settings.  
Perform monitor self-test feature check to  
determine if the intermittent problem occurs in  
self-test mode.  
Missing Color  
Wrong Color  
Picture missing Perform monitor self-test.  
color  
Ensure that the video cable connecting the  
monitor to the computer is connected properly  
and is secure.  
Check for bent or broken pins in the video cable  
connector.  
Picture color  
not good  
Change the settings of the Preset Modes  
in the Color menu OSD depending on the  
application.  
Adjust R/G/B value under Custom Color in  
Color menu OSD.  
Change the Input Color Format to PC RGB or  
YPbPr in the Color menu OSD.  
Run the built-in diagnostics.  
Image retention Faint shadow  
Use the Power Management feature to turn  
from a static  
image left on  
from the static  
off the monitor at all times when not in use  
image displayed (for more information, see Power Management  
the monitor for appears on the  
a long period of screen  
time  
Modes).  
Alternatively, use a dynamically changing  
screensaver.  
Product specific problems  
Problem  
What You  
Possible Solutions  
Experience  
Screen image is Image is  
too small centered on  
Check the Aspect Ratio setting in the Display  
menu OSD.  
screen, but  
does not fill  
entire viewing  
area  
Reset the monitor to factory settings.  
54  
|
Troubleshooting  
Problem  
What You  
Possible Solutions  
Experience  
Cannot adjust  
the monitor  
with the  
OSD does not  
appear on the  
screen  
Turn off the monitor, unplug the monitor power  
cable, plug it back, and then turn on the monitor.  
buttons on the  
front panel  
No Input Signal No picture, the Check the signal source. Ensure the computer  
when user  
controls are  
pressed  
LED light is  
white  
is not in the power saving mode by moving the  
mouse or pressing any key on the keyboard.  
Check whether the signal cable is plugged in  
properly. Re-plug the signal cable if necessary.  
Reset the computer or video player.  
The picture  
The picture  
Due to different video formats (aspect ratio) of  
does not fill the cannot fill the  
entire screen  
DVDs, the monitor may display in full screen.  
height or width Run the built-in diagnostics.  
of the screen  
Troubleshooting  
|
55  
Appendix  
FCC notices (U.S. only) and other regulatory information  
For FCC notices and other regulatory information, see the regulatory compliance  
website located at www.dell.com/regulatory_compliance.  
Contacting Dell  
For customers in the United States, call 800-WWW-DELL (800-999-3355).  
NOTE: If you do not have an active Internet connection, you can find  
contact information on your purchase invoice, packing slip, bill, or Dell  
product catalog.  
Dell provides several online and telephone-based support and service options.  
Availability varies by country and product, and some services may not be  
available in your area.  
Online technical assistance — www.dell.com/support/monitors  
Contacting Dell — www.dell.com/contactdell  
56  
|
Appendix  
 
Outline dimension  
Unit  
: mm(inch)  
S2421HS/HSX Outline Dimension  
Dimension : Nominal  
Drawing : Not to scale  
Swivel  
30  
Swivel  
30  
Z=34.7(1.37)  
Z=43.0(1.69)  
537.8  
[21.17]  
5.4  
[0.21]  
527.0  
[20.75]  
5.4  
[0.21]  
Z=44.0(1.73)(4x)  
Z=0  
M4x10(4x)  
8.8  
[0.34]  
Tilt  
Pivot  
90  
Pivot  
90  
43.9  
[1.73]  
35.2  
[1.38]  
237.0  
[9.33]  
159.7  
179.2  
[7.06]  
[6.29]  
167.2  
[6.58]  
Unit  
: mm(inch)  
Dimension : Nominal  
S2721HS/HSX Outline Dimension  
Drawing : Not to scale  
Swivel  
30  
Swivel  
30  
609.9  
[24.01]  
Z=34.7(1.37)  
Z=43.0(1.69)  
6.0  
[0.24]  
597.9  
[23.54]  
6.0  
[0.24]  
Z=0  
Z=44.0(1.73) (4x)  
M4x10(4x)  
Tilt  
9.6  
[0.38]  
5
Pivot  
90  
Pivot  
90  
54.9  
[2.16]  
174.7  
[6.88]  
181.8  
[7.16]  
45.3  
257.0  
[10.12]  
[1.78]  
191.2  
[7.53]  

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