dc7600 Series Personal Computer Service Reference Guide (2nd Edition)

D–4 390742-002 Service Reference Guide, dc7600
Troubleshooting Without Diagnostics
System does not power
on and the LEDs on the
front of the computer
are not flashing.
System unable to power
on.
Press and hold the power button for
less than 4 seconds. If the hard drive
LED turns green, then 5V Aux is
present and the power button is
working correctly.
1. Check that the voltage selector
(some models) is set to the
appropriate voltage.
2. Replace the system board.
OR
Press and hold the power button for
less than 4 seconds. The hard drive
LED does not turn on green.
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. If the 5 V_aux light on the system
board is on, then replace the
power button harness.
5. Replace the system board.
6. If the 5 V_aux light on the system
board is off then, remove the
expansion cards one at a time
until the 5 V_aux light on the
system board turns on.
7. If the 5 V_aux light on the system
board is off, then replace the
power supply.
Solving Minor Problems (Continued)
Problem Cause Possible Solution