POST Error Messages

POST Diagnostic Front Panel LEDs and Audible Codes (Continued)

Activity

Beeps

Possible Cause

 

Recommended Action

 

 

 

 

System does not

None

System unable to

Press and hold the power button for less

power on and

 

power on.

than 4 seconds. If the hard drive LED turns

LEDs are not

 

 

green, the power button is working

flashing.

 

 

correctly. Try the following:

 

 

 

1.

Check that the voltage selector (some

 

 

 

 

models), located on the rear of the

 

 

 

 

power supply, is set to the appropriate

 

 

 

 

voltage. Proper voltage setting

 

 

 

 

depends on your region.

 

 

 

2.

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 5 V_aux light on the system board is turned on. If it is turned on, then replace the power button harness.

5. If the 5 V_aux light on the system board is not turned on, remove the expansion cards one at a time until the 5 V_aux light on the system board turns on. If the problem persists, replace the power supply.

 

Service Reference Guide, dc7700

433612-001

C–13