Table 7-1 POST numeric codes and text messages (continued)
Control panel message Description Recommended action
800-Keyboard Error Keyboard failure. 1. Reconnect keyboard with computer
turned off.
2. Check connector for bent or
missing pins.
3. Be sure that none of the keys are
pressed.
4. Replace keyboard.
801-Keyboard or System Unit Error Keyboard failure. 1. Reconnect the keyboard with
computer turned off.
2. Be sure that none of the keys are
pressed.
3. Replace the keyboard.
4. Replace the system board.
900-CPU Fan Not Detected CPU fan is not connected or might have
malfunctioned.
1. Reseat fan.
2. Reseat fan cable.
3. Replace fan.
901-Chassis, Rear Chassis, Front
Chassis, or PCIe blower Fan not
Detected
Fan is not connected or might have
malfunctioned.
1. Reseat fan.
2. Reseat fan cable.
3. Replace fan.
904-SATA Cabling Error One or more SATA devices are
improperly attached. For optimal
performance, the SATA0, SATA1, and
SATA2 ports should be used for hard
drives before other ports.
Be sure that SATA connectors are used
in ascending order. For one device, use
SATA0. For two devices, use SATA0 and
SATA1. For three devices, use SATA0,
SATA1, and SATA2.
90B-Fan Failure The system has detected that a cooling
fan is not operating correctly.
1. Reseat fan.
2. Reseat fan cable.
3. Replace fan.
90D-System Temperature Thermal shutdown occurred. The system
BIOS has detected that your machine
was previously shut down to avoid
overheating. Overheating might 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.
Be sure system has proper airflow.
90E-Power Supply Fan Not detected Power supply fan is not connected or
might have malfunctioned.
1. Reseat power supply fan.
2. Reseat fan cable.
3. Replace power supply fan.
910–Filter Warning Airflow filter is dirty. Replace the airflow filter.
94 Chapter 7 POST error messages
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