HP Pro 6305 manual Some models, is set to the appropriate voltage. Proper

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.
OR	2.	Open the access panel, press the power button, and see
		if the processor fan (or other system fan) spins. If the fan
The heat sink is not properly attached to the processor.		does 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 All-in One or USDT.

The power supply adapter must be at the correct power rating and use the Smart ID technology before the system will power up. Replace the power supply adapter with the HP-supplied power supply adapter.

Solving Power Problems 153