HP 402 G1 manual Solving power problems, 2Solving Power Problems

Solving power problems

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

Table 7-2Solving Power Problems

Power supply shuts down intermittently.

Cause	Solution
If equipped with a voltage selector, voltage selector switch on	Select the proper AC voltage using the selector switch.
rear of computer chassis (some models) not switched to correct
line voltage (115V or 230V).
Power supply will not turn on because of internal power supply	Replace the power supply.
fault.

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 the
A fan may be blocked or not turning.		processor cooling fan is running.
	2.	Open the access panel, press the power button, and see if
OR
		the processor fan (or other system fan) spins. If the fan does
The heat sink is not properly attached to the processor.		not spin, make sure the fan cable is plugged onto the
		system board header.
	3.	If fan a plugged in and not spinning, replace it.

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.	If equipped with a voltage selector, 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 access panel and ensure the 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 drives or optical drives and
		expansion cards). Power on the system. If the system enters
		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.
The incorrect external power supply adapter is being used on the	The power supply adapter must be at the correct power rating
All-in One or USDT.	and use the Smart ID technology before the system will power up.
	Replace the power supply adapter with the HP-supplied power
	supply adapter.

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