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Interpreting System Validation Diagnostic Front Panel Leds And Audible Codes - HP ProDesk 400 G4 Maintenance And Service Manual

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Control panel message
90B-Fan Failure
90D-System Temperature
90E-Power Supply Fan Not detected
910–Filter Warning
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
84
Chapter 7 POST error messages and diagnostic front panel LEDs and audible codes
Description
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.
Power supply fan is not connected or may have
malfunctioned.
Airflow filter is dirty.
Error category
Not used
BIOS
Hardware
Recommended action
1.
Reseat fan.
2.
Reseat fan cable.
3.
Replace fan.
Make sure system has proper airflow.
1.
Reseat power supply fan.
2.
Reseat fan cable.
3.
Replace power supply fan.
Replace the airflow filter.

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