HP Pro 110 manual Board needs to be replaced

Table A-2Diagnostic Front Panel LEDs and Audible Codes (continued)

Activity	Beeps	Possible Cause	Recommended Action
Red Power LED flashes nine	9	System powers on but is	1.	Unplug the AC power cord from the
times, once every second,		unable to boot.		computer, wait 30 seconds, then plug the
followed by a two second				power cord back in to the computer.
pause. Beeps stop after fifth			2.	Replace the system board.
iteration but LEDs continue
until problem is solved.			3.	Replace the processor.
Red Power LED flashes ten	10	Bad option card.	1.	Check each option card by removing the
times, once every second,				card (one at a time if multiple cards), then
followed by a two second				power on the system to see if fault goes
pause. Beeps stop after fifth				away.
iteration but LEDs continue			2.	Once a bad card is identified, remove and
until problem is solved.
				replace the bad option card.
			3.	Replace the system board.
Red Power LED flashes	11	The current processor	1.	Install a Trusted Execution Technology
eleven times, once every		does not support a		(TXT) capable processor.
second, followed by a two		feature previously	2.	Disable TXT in the Computer Setup (F10)
second pause. Beeps stop		enabled on this system.
after fifth iteration but LEDs				utility.
continue until problem is			3.	Reinstall the original processor.
solved.
System does not power on	None	System unable to power	Press and hold the power button for less than 4
and LEDs are not flashing.		on.	seconds. If the hard drive LED turns green, the
			power button is working correctly and the system
			board needs to be replaced.
			OR
			Press and hold the power button for less than 4
			seconds. If the hard drive LED does not turn on
			green then:
			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.

Interpreting POST Diagnostic Front Panel LEDs and Audible Codes 75