Troubleshooting Without Diagnostics

Solving Minor Problems (Continued)

Problem

Cause

Possible Solution

System does not power

System unable to power

Press and hold the power button for

on and the LEDs on the

on.

less than 4 seconds. If the hard drive

front of the computer

 

LED turns green, then 5V Aux is

are not flashing.

 

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.

 

 

 

 

D–4

390742-002

Service Reference Guide, dc7600