HP EliteDesk 800 G6 Maintenance and Service Guide - Page 102

Interpreting system validation diagnostic front panel LEDs and audible codes

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Table 7-1 POST numeric codes and text messages (continued) Control panel message Description Recommended action 2. Be sure that none of the keys are depressed. 3. Replace the keyboard. 4. Replace the system board. 900-CPU Fan Not Detected CPU fan is not connected or may have malfunctioned. 1. Reseat fan. 2. Reseat fan cable. 3. Replace fan. 901-Chassis, Rear Chassis, or Front Chassis Fan is not connected or might have Fan not Detected 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 SATA 0 and SATA 1 ports should be used for hard drives before other ports. 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. 90B-Fan Failure The system has detected that a cooling fan 1. is not operating correctly. 2. 3. Reseat fan. Reseat fan.cable. Replace fan. 90D-System Temperature 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. Make sure system has proper airflow. 90E-Power Supply Fan Not detected Power supply fan is not connected or may 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. Interpreting system validation diagnostic front panel LEDs and audible codes This section identifies the front panel light codes as well as the audible codes that can occur before or during POST that might not have an error code or text message associated with them. CAUTION: When the computer is plugged into an AC power source, voltage is always applied to the system board. To reduce the risk of personal injury from electrical shock and/or hot surfaces, be sure to disconnect the power cord from the AC outlet and allow the internal system components to cool before touching. During the system validation phase that occurs at system startup, the BIOS validates the functionality of the following subsystems and conditions: 92 Chapter 7 POST error messages

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Table 7-1
POST numeric codes and text messages (continued)
Control panel message
Description
Recommended action
2.
Be sure that none of the keys are
depressed.
3.
Replace the keyboard.
4.
Replace the system board.
900-CPU Fan Not Detected
CPU fan is not connected or may have
malfunctioned.
1.
Reseat fan.
2.
Reseat fan cable.
3.
Replace fan.
901-Chassis, Rear Chassis, or Front Chassis
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
SATA 0 and SATA 1 ports should be used for
hard drives before other ports.
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.
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 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.
Make sure system has proper
airflow.
90E-Power Supply Fan Not detected
Power supply fan is not connected or may
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.
Interpreting system validation diagnostic front panel LEDs and
audible codes
This section
identifies
the front panel light codes as well as the audible codes that can occur before or during
POST that might not have an error code or text message associated with them.
CAUTION:
When the computer is plugged into an AC power source, voltage is always applied to the system
board. To reduce the risk of personal injury from electrical shock and/or hot surfaces, be sure to disconnect
the power cord from the AC outlet and allow the internal system components to cool before touching.
During the system validation phase that occurs at system startup, the BIOS validates the functionality of the
following subsystems and conditions:
92
Chapter 7
POST error messages