Troubleshooting Instructions - Dell S2421HS Simplified Service Manual

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
Dell 24 Monitor
No DP Cable
The display will go into Standby mode in 4 minutes.
www.dell.com/S2421HS
www.dell.com/S2421HSX
or
Dell 24 Monitor
No HDMI Cable
The display will go into Standby mode in 4 minutes.
www.dell.com/S2421HS
www.dell.com/S2421HSX
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.
If your monitor screen remains blank after you use the previous procedure, check your
video controller and computer, because your monitor is functioning properly.
5. Trouble Shooting Instructions
S2721HS/S2721HSX
S2421HS/S2421HSX
or
S2421HS/S2421HSX
Dell 27 Monitor
No DP Cable
The display will go into Standby mode in 4 minutes.
www.dell.com/S2721HS
www.dell.com/S2721HSX
Dell 27 Monitor
No HDMI Cable
The display will go into Standby mode in 4 minutes.
www.dell.com/S2721HS
www.dell.com/S2721HSX
S2721HS/S2721HSX
S2721HS/S2721HSX