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

[BeemerBiker]

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@Aard wrote:

Dear BeemerBiker,
Thank you for your detailed response and troubleshooting suggestions.
To clarify, my system is the HP Pavilion Desktop TP01-3104ng PC (Product No. A4AM5EA). 

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Your system, may not be actually shutting down. the following is for a laptop but is also true for your desktop system.

Clicking on the windows 10 or 11 power 'Shut Down' should turn off the laptop.
If your laptop is unplugged and you find the battery has significantly drained overnight, one or move devices are drawing power. Windows allows some devices to continue to draw power as explained here. it is also possible that a Windows update replaced a device driver with one that is not power efficient.

Some devices that can cause to cause power drain:

USB hubs that can allow charging of devices
Thunderbolt port that can be used to dock with
The Intel Management Engine may tasks some device to maintain power.

Run the following command from the windows administrators command prompt

powercfg -devicequery wake_armed

for example the following devices are enabled even if the PC is turned off

They are all drawing power EVEN WHEN LAPTOP IS TURNED OFF.

You can disable these devices using the device manager as explained in step 1 here

Note that newer laptops and desktops use Modern Standby and are missing the Power Management option. If you are using Modern Standby then your bios is configured to use S0. Some BIOS allow S3 to be selected instead of S0. If not, then this article explains how to disable it. If you decide to try disabling using any of the methods explained, be sure to set a restore point in Windows to make it easy to return to s0 state.

If you are using Modern Standby then your bios is configured to use S0.

Please copy and paste the following command into Windows Command Prompt using Administrator mode.

powercfg /a

Should look something like this:

If there is a problem with modern standby possibly your BIOS setup has the option to use S3 instead of S0.

If not, then this article explains how to disable it. If you decide to try disabling using any of the methods explained, be sure to set a restore point in Windows to make it easy to return to s0 state.

Disable modern standby with :

reg add HKLM\System\CurrentControlSet\Control\Power /v PlatformAoAcOverride /t REG_DWORD /d 0

Windows sleep diagnostics are shown here

Let me know what you find out.

[Aard]

HP Pavilion Desktop TP01-3104ng PC (Product No. A4AM5EA): s/n: 4CE423BPWS