HP 280 G1 manual Check that the unit is plugged into a working, AC outlet

Activity	Beeps	Possible cause	Recommended action
			1.	Check that the unit is plugged into a working
				AC outlet.
			2.	Open hood and check that the power button
				harness is properly connected to the system
				board.
			3.	Check that both power supply cables are
				properly connected to the system board.
			4.	Check to see if the 5V_aux light on the system
				board is turned on. If it is turned on, then
				replace the power button harness. If the
				problem persists, replace the system board.
			5.	If the 5V_aux light on the system board is not
				turned on, remove the expansion cards one at

a time until the 5V_aux light on the system board turns on. It the problem persists, replace the power supply.

102 Chapter 8 POST error messages