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HP Notebook PCs - System Fan (90F) Error Message on Startup

This document pertains to HP and Compaq notebook PCs.
When starting the computer, the following error appears on the screen:
The system has detected that a cooling fan is not operating correctly.
System Fan (90f) This error indicates that a problem exists related to the heat removal system.
This message indicates that the system fan is not spinning at the expected speed and occurs to ensure proper computer operation.
To fix this error, use the following steps:
  1. Press Enter to clear the message and allow the system to boot to the Windows Desktop.
  2. Shut down the computer.
  3. While the computer is turned off, inspect and clean the exterior vents to remove dust buildup by blowing air through the vent openings. Dust can accumulate inside the vent openings and around internal cooling components, preventing the removal of heat. After the dust has been removed, turn on the computer. If the error message continues, go to the next step.
    For more information on reducing heat inside your computer, see Reducing Heat Inside the PC.
  4. In some cases, updating the BIOS might help prevent this error from occurring. For information on how to update your BIOS, see Updating the BIOS.
  5. Have the computer serviced to clean internal components and replace the system fan if necessary.

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