HP Dc7100 Troubleshooting Guide - Page 80

connected to the system board., Check that both power supply

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POST Error Messages Diagnostic Front Panel LEDs and Audible Codes (Continued) Activity Beeps Possible Cause Recommended Action System does not power on and LEDs are not flashing. None System unable to power on. Press and hold the power button for less than 4 seconds. If the hard drive LED turns green, then: 1. Check that the voltage selector, located on the rear of the power supply, is set to the appropriate voltage. Proper voltage setting depends on your region. 2. Remove the expansion cards one at a time until the 3V_aux light on the system board turns on. 3. Replace the system board. OR Press and hold the power button for less than 4 seconds. If the hard drive LED does not turn on green then: 1. Check that the unit is plugged into a working AC outlet. 2. Open hood and check that the power button harness is properly connected to the system board. 3. Check that both power supply cables are properly connected to the system board. 4. Check to see if the 3V_aux light on the system board is turned on. If it is turned on, then replace the power button harness. 5. If the 3V_aux light on the system board is not turned on, then replace the power supply. 6. Replace the system board. A-18 www.hp.com Troubleshooting Guide

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A–18
www.hp.com
Troubleshooting Guide
POST Error Messages
System does not
power on and LEDs
are not flashing.
None
System unable to
power on.
Press and hold the power button for less
than 4 seconds. If the hard drive LED
turns green, then:
1. Check that the voltage selector,
located on the rear of the power
supply, is set to the appropriate
voltage. Proper voltage setting
depends on your region.
2.
Remove the expansion cards one at
a time until the 3V_aux light on the
system board turns on.
3. Replace the system board.
OR
Press and hold the power button for less
than 4 seconds. If the hard drive LED
does not turn on green then:
1. Check that the unit is plugged into
a working AC outlet.
2. Open hood and check that the
power button harness is properly
connected to the system board.
3. Check that both power supply
cables are properly connected to
the system board.
4. Check to see if the 3V_aux light on
the system board is turned on. If it
is turned on, then replace the
power button harness.
5. If the 3V_aux light on the system
board is not turned on, then
replace the power supply.
6. Replace the system board.
Diagnostic Front Panel LEDs and Audible Codes
(Continued)
Activity
Beeps
Possible Cause
Recommended Action