HP E1Z74UT E1Z74UT#ABA, E1Z77UT E1Z77UT#ABA manual Is not spinning, make sure the fans cable is

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				running.
pause. Beeps stop after fifth		A fan may be blocked or
iteration but LEDs continue until		not turning.	2.	Open hood, press power button, and see if
problem is solved.		OR		the processor fan spins. If the processor fan
				is not spinning, make sure the fan's cable is
		The heat sink/fan		plugged onto the system board header.
		assembly is not properly	3.	If fan is plugged in, but is not spinning, then
		attached to the processor.		replace heat sink/fan assembly.
			4.	Contact an authorized reseller or service
				provider.

Red Power LED flashes three 3

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

Processor not installed (not	1.	Check to see that the processor is present.
an indicator of bad
processor).	2.	Reseat the processor.

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
iteration but LEDs continue until			2.	Check if a device is causing the problem by
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

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

Pre-video memory error.

CAUTION: To avoid damage to the DIMMs or the system board, you must unplug the computer power cord before attempting to reseat, install, or remove a DIMM module.

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.

Interpreting POST diagnostic front panel LEDs and audible codes 197