HP 402 G1 manual Interpreting Post diagnostic front panel LEDs, Possible Cause Recommended Action

Table 10-2Diagnostic front panel LEDs and audible codes (continued)

Activity	Beeps	Possible Cause	Recommended Action
Red Power LED flashes two	2	Processor thermal	1.	Ensure that the computer air vents are not
times, once every second,		protection activated:		blocked and the processor cooling fan is
followed by a two second pause.		A fan may be blocked or not		running.
Beeps stop after fifth iteration
		turning.	2.	Open hood, press power button, and see if the
but LEDs continue until problem
				processor fan spins. If the processor fan is not
is solved.		OR
				spinning, make sure the fan's cable is plugged
		The heat sink/fan assembly		onto the system board header.
		is not properly attached to	3.	If fan is plugged in, but is not spinning, then
		the processor.
				replace heat sink/fan assembly.
			4.	Contact an authorized reseller or service
				provider.
Red Power LED flashes three	3	Processor not installed (not	1.	Check to see that the processor is present.
times, once every second,		an indicator of bad	2.	Reseat the processor.
followed by a two second pause.		processor).
Beeps stop after fifth iteration
but LEDs continue until problem
is solved.
Red Power LED flashes four	4	Power failure (power supply	1.	Open the hood and ensure the 4 or 6-wire
times, once every second,		is overloaded).		power supply cable is seated into the
followed by a two second pause.				connector on the system board.
Beeps stop after fifth iteration			2.	Check if a device is causing the problem by
but LEDs continue until problem
				removing ALL attached devices. Power on the
is solved.
				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 DIMMs or the
times, once every second,			system board, you must unplug the computer power
followed by a two second pause.			cord before attempting to reseat, install, or remove
Beeps stop after fifth iteration			a DIMM module.
but LEDs continue until problem			1.	Reseat DIMMs.
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 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.

Interpreting POST diagnostic front panel LEDs 101