Common Problems - Dell S2421Ho User Manual

Common problems

The following table contains general information about common monitor problems you
might encounter and the possible solutions.
Common
symptoms
No video/
Power LED off
No video/
Power LED on
Missing pixels
Stuck-on pixels LCD screen has
What you Possible solutions
experience
No picture • Ensure that the video cable connecting the
• Verify that the power outlet is functioning
• Ensure that the power button is depressed fully.
• Ensure that the correct input source is selected
No picture or no • Increase brightness and contrast controls
brightness
• Perform monitor self-test feature check.
• Check for bent or broken pins in the video cable
• Run the built-in diagnostics.
• Ensure that the correct input source is selected
LCD screen has • Cycle power on-off.
spots
• Pixel that is permanently off is a natural defect
• For more information about Dell Monitor Quality
• Cycle power On-Off.
bright spots
• Pixel that is permanently off is a natural defect
• For more information about Dell Monitor Quality
monitor and the computer is properly connected
and secure.
properly using any other electrical equipment.
in the Input Source
through OSD.
connector.
in the Input Source
that can occur in LCD technology.
and Pixel Policy, see Dell Support site at:
https://www.dell.com/support/monitors.
that can occur in LCD technology.
and PixelPolicy, see Dell Support site at:
https://www.dell.com/support/monitors.
menu.
menu.
Troubleshooting | 53