Troubleshooting; Common Problems - Dell D2421H User Manual

Troubleshooting

WARNING:
Before you begin any of the procedures in this section, follow the
Safety Instructions

Common Problems

The following table contains general information about common monitor problems you
might encounter and the possible solutions.
Common Symptoms What You
No Video/Power LED
off
No Video/Power LED
on
Poor Focus
Experience
No picture
No picture or no
brightness
Picture is fuzzy,
blurry, or ghosting
Possible Solutions
• 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 via the Input Source
button.
• Increase brightness & contrast controls
via OSD.
• Perform monitor self-test feature
check.
• Check for bent or broken pins in the
video cable connector.
• Ensure that the correct input source is
selected via the Input Source
menu.
• Perform Auto Adjust via OSD.
• Adjust the Phase and Pixel Clock
controls via OSD.
• Eliminate video extension cables.
• Reset the monitor to
• Change the video resolution to the
correct aspect ratio (16:9).
Troubleshooting
select
select
Factory Reset.
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