HP ProOne 400 Maintenance & Service Guide - Page 146

Interpreting system validation diagnostic front panel LEDs and audible codes

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Control panel message 90B-Fan Failure 90D-System Temperature 90E-Power Supply Fan Not detected 910-Filter Warning Description Recommended action The system has detected that a cooling fan is not operating correctly. 1. Reseat fan. 2. Reseat fan cable. 3. Replace fan. 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. Power supply fan is not connected or may have 1. Reseat power supply fan. malfunctioned. 2. Reseat fan cable. 3. Replace power supply fan. Airflow filter is dirty. Replace the airflow filter. Interpreting system validation diagnostic front panel LEDs and audible codes During the system validation phase that occurs at system startup, the BIOS validates the functionality of the following subsystems and conditions: ● AC adapter ● System board power ● Processor failure ● BIOS corruption ● Memory failure ● Graphics failure ● System board failure ● BIOS authentication failure If an error is detected, specific patterns of long and short blinks, accompanied by long and short beeps (where applicable) are used to identify the error. These patterns will make up a two part code: ● Major - the category of the error ● Minor - the specific error within the category NOTE: Single beep/blink codes are not used. Number of long beeps/blinks 1 2 3 Error category Not used BIOS Hardware 136 Chapter 9 POST error messages and diagnostic front panel LEDs and audible codes

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Control panel message
Description
Recommended action
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
During the system validation phase that occurs at system startup, the BIOS validates the functionality of the
following subsystems and conditions:
●
AC adapter
●
System board power
●
Processor failure
●
BIOS corruption
●
Memory failure
●
Graphics failure
●
System board failure
●
BIOS authentication failure
If an error is detected,
specific
patterns of long and short blinks, accompanied by long and short beeps (where
applicable) are used to identify the error. These patterns will make up a two part code:
●
Major – the category of the error
●
Minor – the
specific
error within the category
NOTE:
Single beep/blink codes are not used.
Number of long beeps/blinks
Error category
1
Not used
2
BIOS
3
Hardware
136
Chapter 9
POST error messages and diagnostic front panel LEDs and audible codes