HP Pro 6305 C1E21UT#ABA, E3S36UT#ABA, E3S33UT#ABA manual 2Solving Power Problems

Solving Power Problems

Common causes and solutions for power problems are listed in the following table.

Table 8-2Solving Power Problems

Power supply shuts down intermittently.

Cause	Solution
Voltage selector switch on rear of computer chassis (some	Select the proper AC voltage using the selector switch.
models) not switched to correct line voltage (115V or 230V).
Power supply will not turn on because of internal power	Contact an authorized service provider to replace the power
supply fault.	supply.

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.

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

Cause	Solution
Power failure (power supply is overloaded).	1.	Check that the voltage selector, located on the rear of
		the power supply (some models), is set to the
		appropriate voltage. Proper voltage setting depends on
		your region.
	2.	Open the hood and ensure the 4- or 6-wire power
		supply cable is seated into the connector on the system
		board.
	3.	Check if a device is causing the problem by removing
		ALL attached devices (such as hard or optical drives,
		and expansion cards). Power on the system. If the
		system enters the POST, then power off and replace
		one device at a time and repeat this procedure until
		failure occurs. Replace the device that is causing the
		failure. Continue adding devices one at a time to ensure
		all devices are functioning properly.
	4.	Replace the power supply.
	5.	Replace the system board.

144 Chapter 8 Troubleshooting Without Diagnostics