90E-Power Supply Fan Not Detected fault

[Adam0804]

Hi,

My AIO PC started to display following fault - 90E-Power Supply Fan Not Detected. I've updated all drivers and ran all available diagnostic but issue still appears. Has anyone experienced anything like that and is there any way to fix it?

Many thanks

Adam

[Kuroi_Kenshi]

Hi @Adam0804,

Welcome to the HP Support Community!

Thanks for reaching out!

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

I understand your All-in-One PC is showing the 90E – Power Supply Fan Not Detected error. Let’s go through a few steps to check what could be causing this.

Perform a hard reset
Power off the PC and disconnect the power cable from the wall.
Press and hold the power button for 15–20 seconds, then reconnect power and turn the system on.

Reset BIOS to default settings
Restart the PC and press F10 to enter BIOS Setup.
Choose Restore Defaults or Load Setup Defaults, save the changes, and reboot.

Update or reflash the BIOS
Download the latest BIOS available for your AIO model from the HP website.
Install the BIOS update to ensure the fan monitoring firmware is not corrupted.

Check system ventilation and fan operation
Ensure all vents are clear of dust and the system has proper airflow.
Power on the PC and listen closely to confirm whether the power supply fan is spinning.

Run HP UEFI Hardware Diagnostics
Restart the PC and press F2 to open HP Hardware Diagnostics (UEFI).
Run the system board and thermal tests to verify fan detection at the firmware level.

Test behavior after acknowledging the error
If the system allows you to continue after the warning, observe whether the PC overheats or shuts down unexpectedly.
Normal temperatures with a persistent warning usually indicate a failed fan sensor rather than a software issue.

Check for recent environmental or power changes
Confirm the PC is connected directly to a stable wall outlet and not a faulty power strip.
Sudden power fluctuations can trigger power supply fan detection faults.

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! 👍✨

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Best regards,