Desktop Computer Quick Reference Guide

Troubleshooting 37
• If the power button LED is off, the computer is either turned off or is not
receiving power.
– Reseat the power cable into both the power connector on the back of
the computer and the electrical outlet.
– If the computer is plugged into a power strip, ensure that the power
strip is plugged into an electrical outlet and that the power strip is
turned on.
– Bypass power protection devices, power strips, and power extension
cables to verify that the computer turns on properly.
– Ensure that the electrical outlet is working by testing it with another
device, such as a lamp.
– Ensure that the main power cable and front panel cable are securely
connected to the system board (see the
Service Manual at
support.dell.com ).
NOTE: All front panel and back panel LEDs will turn off during sleep states.
Beep Codes
Your computer may emit a series of beeps during start up. The series of beeps
is called a beep code and can be used to help identify a problem with your
computer.
If your computer emits a series of beeps during start-up:
1
Write down the beep code.
2 Run the Dell Diagnostics to identify the cause (see "Dell™ Diagnostics" on
page 29).
3 See "Contacting Dell" on page 72 for instructions on obtaining technical
assistance.
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