HP Mini dc7700 tower manual 222

Troubleshooting Without Diagnostics

Solving Minor Problems (Continued)

Problem Cause Possible 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 continue for five iterations after which the LED flashes will continue until the problem is resolved.

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.

3.Replace the processor heatsink-fan assembly.

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:
are not flashing.		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. 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.	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.

D–4 433612-001 Service Reference Guide, dc7700