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HP PCs - 900, 901, 909, 90A, 90B, 90E, 90F, 911 error is displayed on a black screen

When starting the computer, the system fan might spin faster and become louder, and one of the following error messages might be displayed 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.

  • 901 Chassis fan is not connected or may have malfunctioned

  • 90E Power Supply fan is not connected or may have malfunctioned

  • 911 Graphics module fan is not connected or may have malfunctioned

Use the procedure in this document to resolve the error.

Resolve a 900, 909, 90A, 90B, 90F error on a black screen

To resolve the error, take the following steps.

  1. Press enter to clear the message and allow the system to start to the Windows desktop.

  2. Turn off 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.

    For more information about reducing heat inside your computer, see HP Notebook PCs - Reduce heat inside the laptop to prevent overheating in Windows or HP Desktop PCs - Reduce heat inside the computer to prevent overheating.

  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 the memory and enable you to use the computer for a short time to access and save important files before service.

    For more information about performing a hard reset, see HP PCs - How to Power Reset Your Computer.

  5. In some cases, updating the BIOS might help prevent this error from occurring.

    For more information about how to update the BIOS, see the document for your computer:

  6. If the error message persists, contact HP Customer Support.

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