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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
(see
"Contacting Dell
" on page 159).