HP E1Z74UT E1Z74UT#ABA, E1Z77UT E1Z77UT#ABA, E1Z75UT E1Z75UT#ABA CPU or Chassis Fan not Detected

Control panel message	Description	Recommended action
514-CPU or Chassis Fan not Detected	CPU or chassis fan is not connected or may	1.	Reseat CPU or chassis fan.
	have malfunctioned.
		2.	Reseat fan cable.
		3.	Replace CPU or chassis fan.
515-Power Supply fan not detected	Power supply fan is not connected or may	1.	Reseat power supply fan.
	have malfunctioned.
		2.	Reseat fan cable.
		3.	Replace power supply fan.

601-Diskette Controller Error	Diskette controller circuitry or floppy drive
	circuitry incorrect.

1.Check and/or replace cables.

2.Clear CMOS. (See Appendix B, Password security and resetting CMOS on page 200.)

		3.	Replace diskette drive.
		4.	Replace the system board.
605-Diskette Drive Type Error	Mismatch in drive type.	1.	Disconnect any other diskette controller
			devices (tape drives).
		2.	Clear CMOS. (See Appendix B,
			Password security and resetting CMOS
			on page 200.)

660-Display cache is detected unreliable	Integrated graphics controller display cache
	is not working properly and will be disabled.

Replace system board if minimal graphics degrading is an issue.

912-Computer Cover Has Been Removed	Computer cover was removed since last	No action required.
Since Last System Startup	system startup.

917-Front Audio Not Connected	Front audio harness has been detached or
	unseated from motherboard.

Reconnect or replace front audio harness.

918-Front USB Not Connected	Front USB harness has been detached or
	unseated from motherboard.

Reconnect or replace front USB harness.

921-Device in PCI Express slot failed to initialize

There is an incompatibility/problem with this device and the system or PCI Express Link could not be retrained to an x1.

Try rebooting the system. If the error reoccurs, the device may not work with this system

1151-Serial Port A Address Conflict Detected Both external and internal serial ports are assigned to COM1.

1.Remove any serial port expansion cards.

2.Clear CMOS. (See Appendix B, Password security and resetting CMOS on page 200.)

3.Reconfigure card resources and/or run Computer Setup or Windows utilities.

POST numeric codes and text messages 191