HP E1Z75UT E1Z75UT#ABA, E1Z74UT E1Z74UT#ABA manual Verify monitor is attached and turned

Control panel message	Description	Recommended action
301-Keyboard Error	Keyboard failure.	1.	Reconnect keyboard with computer
			turned off.
		2.	Check connector for bent or missing
			pins.
		3.	Ensure that none of the keys are
			depressed.
		4.	Replace keyboard.
303-Keyboard Controller Error	I/O board keyboard controller.	1.	Reconnect keyboard with computer
			turned off.
		2.	Replace the system board.
304-Keyboard or System Unit Error	Keyboard failure.	1.	Reconnect the keyboard with computer
			turned off.
		2.	Ensure that none of the keys are
			depressed.
		3.	Replace the keyboard.
		4.	Replace the system board.
501-Display Adapter Failure	Graphics display controller.	1.	Reseat the graphics card (if applicable).
		2.	Clear CMOS. (See Appendix B,
			Password security and resetting CMOS
			on page 200.)
		3.	Verify monitor is attached and turned
			on.
		4.	Replace the graphics card (if possible).
510-Flash Screen Image Corrupted	Flash Screen image has errors.	Reflash the system ROM with the latest BIOS
		image.
511-CPU, CPUA, or CPUB Fan not Detected	CPU fan is not connected or may have	1.	Reseat CPU fan.
	malfunctioned.
		2.	Reseat fan cable.
		3.	Replace CPU fan.

512-Chassis, Rear Chassis, or Front Chassis Fan not Detected

Chassis, rear chassis, or front chassis fan is	1.	Reseat chassis, rear chassis, or front
not connected or may have malfunctioned.		chassis fan.
	2.	Reseat fan cable.

		3.	Replace chassis, rear chassis, or front
			chassis fan.
513-Front Chassis fan not detected	Front chassis fan is not connected or may	1.	Reseat front chassis fan.
	have malfunctioned.
		2.	Reseat fan cable.
		3.	Replace front chassis fan.

190 Chapter 9 POST error messages