Fan turning fast after shutdown

[Aard]

"After shutting down my Pavilion Desktop TP01-3xxx, one of the internal fans begins spinning at high speed and generates a lot of noise. This happens consistently after powering off the system. Is there a way to prevent this behavior or adjust the fan settings?"

[Bill_To]

Greetings @Aard 

Welcome to the HP Forum. 

What fan is doing high RPMs after the PC is shutdown?

Is your PC working okay when you are using Windows?

Please provide a specific HP Product Number. TP01-3xxx is generic. Your specific HP PC might need to try a BIOS update.

An example product number would be: "TP01-3016na".

For some unknown reason (firmware or hardware??) your MB is sending power to a fan header when the PC should be in an "S5-Shutdown" power state.

Try doing a power reset. Instructions are at this HP Site.

You could also remove the MB CR2032 battery to reset CMOS. Check this Video showing how to remove a CR2032 MB battery.

Note: The PC must be disconnected from AC power. Then depress and hold down the power button a few times for about 20 seconds each time to deenergize the MB.

Note: Let the PC sit for about 5 minutes before reinstalling the MB battery. You might want to install a new MB battery while you are resetting CMOS.

Regards

[Aard]

Dear HP Support Team,
I am experiencing an unusual issue with my HP Pavilion Desktop TP01-3104ng PC (Product No. A4AM5EA). After the system is shut down and enters the S5 power state, one of the internal fans continues to spin at high RPMs. This behavior persists even though the PC is completely powered off via Windows shutdown.
To clarify:
• The system operates normally during active Windows sessions.
• The fan noise only occurs post-shutdown, not during sleep or hibernation.
• I have confirmed that the system is not waking due to scheduled tasks or network activity.
I suspect this may be related to a firmware or BIOS-level anomaly where the motherboard continues supplying power to a fan header inappropriately during S5 state.
Actions Taken:
• I performed a full power reset by disconnecting AC power and pressing the power button for 20 seconds multiple times.
• I plan to reset the CMOS by removing the CR2032 battery as shown in this video guide.
• I am currently checking for any available BIOS updates for this specific model.
Could you please advise:
1. Whether this issue is known for this model or chipset (Intel H670)?
2. If a BIOS update or specific setting (e.g., ErP/EuP, S5 fan control) can resolve this?
3. If there are any recommended diagnostics or firmware patches?
Thank you for your assistance.
Best regards,
Aard

[Bill_To]

Greetings @Aard 

Opinions or troubleshooting suggestions in this response are provided independently. I am not employed by: HP, Inc. or the HP Forum.

Check your PC's hardware using HP Diagnostics as follows:

Start the PC. Repeatedly tap the "ESC" key.

Select "F2". Run extensive system and component tests to confirm: a drive problem, a memory problem, or other component problem.

Maybe diagnostics will find something. I don't know since your PC's problem happens when the PC is shutdown.

Possible BIOS Update:

I cannot find any driver downloads for a HP TP01-3104ng PC. This sometimes happens.

Maybe a different Forum member can assist with the BIOS update problem.

You can locate your PC's serial number by following instructions at this HP Site.

You could then try using your PC's serial number at this HP Site to check for a BIOS update.

Regards