Diagnostic light codes during post – Dell OptiPlex 360 (Late 2008) User Manual
Page 127
Troubleshooting
127
Diagnostic Light Codes During POST
Light Pattern
Problem Description
Suggested Resolution
Off
The computer is
either turned off or
not receiving power.
• Reseat the power cable in the power
connector on the back of the
computer, and the electrical outlet.
• Bypass power strips, power extension
cables, and other power protection
devices to verify the computer turns
on properly.
• Ensure any power strips being used are
plugged into an electrical outlet and
are turned on.
• Ensure the electrical outlet is working
by testing it with another device, such
as a lamp.
• Ensure the main power cable and
front panel cable are securely
connected to the system board.
Off
A possible
motherboard failure
has occurred.
• Unplug the computer. Allow a minute
for the power to drain. Plug the
computer into a working electrical
outlet and press the power button.
• If the problem persists, contact Dell