HP D3K72UT D3K72UT#ABA manual Desktop Management Guide for more

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

Activity	Beeps	Possible Cause	Recommended Action
Red Power LED flashes five	5	Pre-video memory error.	CAUTION: To avoid damage to the DIMMs or
times, once every second,			the system board, you must unplug the computer
followed by a two second			power cord before attempting to reseat, install, or
pause. Beeps stop after fifth			remove a DIMM module.
iteration but LEDs continue			1.	Reseat DIMMs.
until problem is solved.
			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	6	Pre-video graphics error.	For systems with a graphics card:
times, once every second,			1.	Reseat the graphics card.
followed by a two second
pause. Beeps stop after fifth			2.	Replace the graphics card.
iteration but LEDs continue
until problem is solved.			3.	Replace the system board.
			For systems with integrated graphics, replace
			the system board.
Red Power LED flashes	7	System board failure	Replace the system board.
seven times, once every		(ROM detected failure
second, followed by a two		prior to video).
second pause. Beeps stop
after fifth iteration but LEDs
continue until problem is
solved.
Red Power LED flashes eight	8	Invalid ROM based on	1.	Reflash the system ROM with the latest
times, once every second,		bad checksum.		BIOS image. See the “Boot Block
followed by a two second				Emergency Recovery Mode” section of the
pause. Beeps stop after fifth				Desktop Management Guide for more
iteration but LEDs continue				information.
until problem is solved.			2.	Replace the system board.
Red Power LED flashes nine	9	System powers on but is	1.	Check that the voltage selector, located on
times, once every second,		unable to boot.		the rear of the power supply (some
followed by a two second				models), is set to the appropriate voltage.
pause. Beeps stop after fifth				Proper voltage setting depends on your
iteration but LEDs continue				region.
until problem is solved.			2.	Unplug the AC power cord from the
				computer, wait 30 seconds, then plug the
				power cord back in to the computer.
			3.	Replace the system board.
			4.	Replace the processor.

Interpreting POST Diagnostic Front Panel LEDs and Audible Codes 139