Table 7-1 POST numeric codes and text messages (continued)
Control panel message Description Recommended action
910–Filter Warning Airflow filter is dirty. Replace the airflow filter.
911–Graphics Module Fan Not Detected Graphics card fan is not connected or
might have malfunctioned.
1. Reseat graphics card fan.
2. Reseat fan cable.
3. Replace graphics card fan.
912–Incorrect CPU cooler installed for
this configuration
The processor cooler/heat sink does not
match processor power requirement.
Replace the cooler/heat sink to match
the processor power requirement.
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:
● 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.
Interpreting system validation diagnostic front panel LEDs and audible codes
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