HP 8200 A2W54UT#ABA, 6200 Pro H3D90USABA Voltage. Proper voltage setting depends on your region

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, diskette, 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.

The incorrect external power supply adapter is being used on the USDT.

The USDT power supply adapter must be at 135W and use the Smart ID technology before the system will power up. Replace the power supply adapter with the HP-supplied USDT power supply adapter.

Solving Power Problems 271