HP dc5750 manual Activity Beeps Possible Cause Recommended Action

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

Activity	Beeps	Possible Cause	Recommended Action
Red Power LED flashes four	4	Power failure (power	1.	Open the hood and ensure the 4 or 6-wire
times, once every second,		supply is overloaded).		power supply cable is seated into the
followed by a two second				connector on the system board.
pause. Beeps stop after fifth			2.	Check if a device is causing the problem by
iteration but LEDs continue
until problem is solved.				removing ALL attached devices (such as
				hard, diskette, or optical drives, and
				expansion cards). Power on the system. If
				the system enters the 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.
			3.	Replace the power supply.
			4.	Replace the system board.
Red Power LED flashes five	5	Pre-video memory error.
					CAUTION To avoid damage to the
times, once every second,
					DIMMs or the system board, you must
followed by a two second
					unplug the computer power cord before
pause. Beeps stop after fifth
					attempting to reseat, install, or remove a
iteration but LEDs continue
					DIMM module.
until problem is solved.
			1.	Reseat DIMMs.
			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 seven	7	System board failure	Replace the system board.
times, once every second,		(ROM detected failure
followed by a two second		prior to video).
pause. Beeps stop after fifth
iteration but LEDs continue
until problem is solved.

Red Power LED flashes eight 8	Invalid ROM based on bad
times, once every second,	checksum.
followed by a two second
pause. Beeps stop after fifth
iteration but LEDs continue
until problem is solved.

1.Reflash the system ROM with the latest BIOS image. See the “Boot Block Emergency Recovery Mode” section of the Desktop Management Guide on the Documentation and Diagnostics CD for more information.

2.Replace the system board.

ENWW Interpreting POST Diagnostic Front Panel LEDs and Audible Codes 57