HP 280 G1 Replace DIMMs one at a time to isolate, Faulty module, Red Power LED flashes seven

Activity	Beeps	Possible cause	Recommended action
			2.	Replace DIMMs one at a time to isolate the
				faulty module.
			3.	Replace third-party memory with HP memory.
			4.	Replace the system board.
Red Power LED flashes six times,	6	Pre-video graphics error.	For systems with a graphics card:
once every second, followed by			1.	Reseat the graphics card.
a two second pause. Beeps stop
after fifth iteration but LEDs			2.	Replace the graphics card.
continue until problem is solved.
			3.	Replace the system board.
			For systems with integrated graphics, replace the
			system board.
Red Power LED flashes seven	7	System board failure (ROM	Replace the system board.
times, once every second,		detected failure prior to
followed by a two second pause.		video).
Beeps stop after fifth iteration
but LEDs continue until problem
is solved.

Red Power LED flashes eight 8

times, once every second, followed by a two second pause. Beeps stop after fifth iteration but LEDs continue until problem is solved.

Invalid ROM based on bad checksum.

1.Reflash the system ROM with the latest BIOS image.

2.Replace the system board.

Red Power LED flashes nine	9	System powers on but is	1.	Check that the voltage selector, located on the
times, once every second,		unable to boot.		rear of the power supply (some models), is set
followed by a two second pause.				to the appropriate voltage. Proper voltage
Beeps stop after fifth iteration				setting depends on your region.
but LEDs continue until problem			2.	Unplug the AC power cord from the computer,
is solved.
				wait 30 seconds, then plug the power cord
				back in to the computer.
			3.	Replace the system board.
Red Power LED flashes ten	10	Bad option card.	1.	Check each option card by removing the card
times, once every second,				(one at a time if multiple cards), then power on
followed by a two second pause.				the system to see if fault goes away.
Beeps stop after fifth iteration			2.	Once a bad card is identified, remove and
but LEDs continue until problem
				replace the bad option card.
is solved.
			3.	Replace the system board.
System does not power on and	None	System unable to power on.	Press and hold the power button for less than 4
LEDs are not flashing.			seconds. If the hard drive LED turns white, the power
			button is working correctly. Try the following:
			1.	Check that the voltage selector (some models),
				located on the rear of the power supply, is set
				to the appropriate voltage. Proper voltage
				setting depends on your region.
			2.	Replace the system board.
			OR

Press and hold the power button for less than 4 seconds. If the hard drive LED does not turn on white then:

Interpreting POST diagnostic front panel LEDs and audible codes 101