HP 800 G1 E1Z89UTABA, E1Z84UT E1Z84UT#ABA, 800 G1 E3T09UT#ABA Troubleshooting without diagnostics

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.

204 Chapter 9 Troubleshooting without diagnostics