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HP Z4 G4 Maintenance And Service Manual Page 78

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Control panel message
801-Keyboard or System Unit Error
900-CPU Fan Not Detected
901-Chassis, Rear Chassis, or Front Chassis Fan
not Detected
903-Computer Cover Has Been Removed Since
Last System Startup
904-SATA Cabling Error
90B-Fan Failure
90D-System Temperature
70
Chapter 7 POST error messages and diagnostic front panel LEDs and audible codes
Description
Keyboard failure.
CPU fan is not connected or may have
malfunctioned.
Chassis, rear chassis, or front chassis fan is not
connected or may have malfunctioned.
One or more SATA devices are improperly
attached. For optimal performance, the SATA 0
and SATA 1 ports should be used for hard drives
before other ports.
The system has detected that a cooling fan is
not operating correctly.
Thermal shutdown occurred. The system BIOS
has detected your machine was previously shut
down to avoid overheating. Overheating may
occur if the cooling vents are blocked or
the operating temperature exceeds the system
specifications. The machine should return to
normal operation once the situation is resolved.
Recommended action
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.
1.
Reseat CPU fan.
2.
Reseat fan cable.
3.
Replace CPU fan.
1.
Reseat chassis, rear chassis, or front
chassis fan.
2.
Reseat fan cable.
3.
Replace chassis, rear chassis, or front
chassis fan.
N/A
Ensure SATA connectors are used in ascending
order. For one device, use SATA 0. For two
devices, use SATA 0 and SATA 1. For three
devices, use SATA 0, SATA 1, and SATA 2.
1.
Reseat fan.
2.
Reseat fan cable.
3.
Replace fan.
Make sure system has proper airflow.
Make sure all fans are connected and
operational.
Make sure a CPU cooler is properly installed for
each processor.

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