Dell S2421NX - Common Problems

52 | Troubleshooting
Common problems
The following table contains general information about common monitor problems you
might encounter and the possible solutions:
Common
symptoms
What you
experience
Possible solutions
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/
Power LED on
No picture or no
brightness
•Increase brightness and contrast controls
through 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
spots
•Cyclepoweron-off.
•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:
www.dell.com/support/monitors.
Stuck-on Pixels LCD screen has
bright spots
•CyclepowerOn-Off.
•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:
www.dell.com/support/monitors.
Brightness
Problems
Picture too dim
or too bright
•Reset the monitor to factory settings.
•Adjust brightness and contrast controls through
OSD.