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HP PCs - 900, 909, 90A, 90B, 90F Error Displays on a Black Screen

This document pertains to HP and Compaq PCs.
When starting the computer, the system fan might spin faster and become louder, and one of the following error messages might display on the screen:
  • System Fan (90a) The system has detected that a cooling fan is not operating correctly. Press Enter to clear the message...
  • System Fan (90b) The system has detected that a cooling fan is not operating correctly. The system will shutdown in 15 seconds...
  • System Fan Speed Failure (90f) This error indicates that a problem exists related to the heat removal system.
  • CPU Fan Speed Failure (909) The system has detected that a cooling fan may not be working properly.
  • CPU Fan not Detected (900) CPU Fan is not detected or may have malfunctioned.
To resolve the error, take 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, and then 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.
  3. After you remove the dust, turn on the computer. If the error message persists, continue with these steps.
  4. Perform a hard reset. Performing a hard reset can reset recorded thermal values in memory and enable you to use the computer again, even if only for a short time to access and save any important files before service.
    For more information on performing a hard reset, go to Use Hard Reset to Resolve Hardware and Software Issues.
  5. In some cases, updating the BIOS might help prevent this error from occurring.
  6. If the error message still persists, contact HP.

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