At HP startup error 900

[CZC399CL2]

At HP startup error 900: "cpu fan is not working". But in windows the cpu fan is working alright. I cleaned the fan and put even new thermal paste on the cpu. In the bios setup there is no cpufan visible. When I bought this pc there was not a 900-error.
And setting the bios/uefi to factory defaults does not help either.

My email address is: fvr1@telfort.nl

[Kuroi_Kenshi]

Hi @,

Welcome to the HP Support Community!

Thanks for reaching out!

We're thrilled to have the opportunity to assist you and provide a solution.

It sounds like you’ve already spent time opening the system, cleaning the fan, and applying fresh thermal paste. When a warning keeps appearing even after careful work like that, it can feel frustrating and a bit confusing. The good news is that this type of startup message can still be checked step by step.

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:

   • HP Consumer Notebook PCs - Updating the BIOS (Basic Input Output System) (Windows)

   • HP Consumer Desktop PCs - Updating the BIOS (Basic Input Output System) (Windows)

   I hope this helps.

   I'm glad I could help! 😊 If this resolved your issue, please mark it as "Accepted Solution" and click "Yes" on "Was this reply helpful?" Your feedback not only keeps us going but also helps others find the solution faster! 👍✨

   Take care and have an amazing day ahead! 🚀

   Best regards,