HP Compaq Business Desktop dx2000 Technical Information download pdf (Page 77)

Service Reference Guide, dx2000 uT 359782-002 D–3

Troubleshooting Without Diagnostics

Computer powered off

automatically and the

Power LED flashes Red

two times, once every

second, followed by a

two second pause.

Processor thermal

protection activated:

A fan may be blocked or

not turning.

OR

The heatsink is not

properly attached to the

processor.

1. Ensure computer air vents are not

blocked and the cooling fan is

running.

2. Open hood, press power button,

and see if the processor fan

spins. If not spinning, make sure

the fan's cable is plugged onto

the system board header. Ensure

the fan is fully/properly seated or

installed.

3. Replace the processor fan.

4. Reseat processor heatsink and

verify that the fan assembly is

properly attached.

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:

1. Check that the voltage selector is

set to the appropriate voltage.

2. Remove the expansion cards one

at a time until the 3.3 V_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. If the 3.3 V_aux light on the

system board is on, then replace

the power button harness.

5. If the 3.3 V_aux light on the

system board is off, then replace

the power supply.

6. Replace the system board.

Solving Minor Problems (Continued)

Problem Cause Possible Solution

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