HP D3K72UT D3K72UT#ABA manual Cause Solution

Computer powered off automatically and the Power LED flashes Red two times, once every second, followed by a two second pause, and the computer beeps two times. (Beeps stop after fifth iteration but LEDs continue flashing).

Cause	Solution
Processor thermal protection activated:	1.	Ensure that the computer air vents are not blocked and
A fan may be blocked or not turning.		the processor cooling fan is running.
	2.	Open hood, press power button, and see if the
OR
		processor fan spins. If the processor fan is not spinning,
The heat sink is not properly attached to the processor.		make sure the fan's cable is plugged onto the system
		board header.
	3.	If fan is plugged in, but is not spinning, then replace the
		heat sink/fan assembly.
	4.	Contact an authorized reseller or service provider.

System does not power on and the LEDs on the front of the computer are not flashing.

Cause Solution

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 on some models, is set to the appropriate voltage. Proper voltage setting depends on your region.

2.Remove the expansion cards one at a time until the 5V_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 5V_aux light on the system board is turned on. If it is turned on, then replace the power button harness.

5.If the 5V_aux light on the system board is off, then replace the power supply.

6.Replace the system board.

146 Appendix D Troubleshooting Without Diagnostics