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Common problems
The following table provides general information about common monitor problems you
might encounter and the possible solutions:
Common
What you
symptoms
experience
No video/
No picture
Power LED off
No video/
No picture or no
Power LED on
brightness
No video/
When connected
at HDMI/
to some dongle/
DisplayPort/
docking device
USB-C port
at the port, there
is no video when
unpluging/pluging
the Thunderbolt
cable from the
notebook
Missing pixels
LCD screen has
spots
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 pressed fully.
• Ensure that the correct input source is selected
in the
Input Source
• Increase brightness & contrast controls via 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
• Unplug the HDMI/DisplayPort/USB-C cable
from dongle/docking device, then plug the
docking Thunderbolt cable to the notebook.
Plug the HDMI/DisplayPort/USB-C cable 7
seconds later.
• Cycle power On-Off.
• Pixel that is permanently Off is a natural defect
that can occur in LCD technology.
• For more information about Dell Monitor Quality
and Pixel Policy, see Dell support site at:
http://www.dell.com/pixelguidelines.
menu.
menu.
Troubleshooting
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