ACPI BIOS ERROR

[RedBird506]

Having trouble loading Windows. Says preparing automatic repair then says Your device ran into a problem. We'll restart for you. But it just starts all over again. Stop Code: ACPI BIOS ERROR

[Garp_senchau]

@RedBird506, Welcome to HP Support Community,

Thank you for posting your query; I’m here to help by guiding you through steps to resolve this issue

The "ACPI BIOS ERROR" stop code (usually 0x000000A5) indicates a problem between Windows and your computer's BIOS, particularly with ACPI (Advanced Configuration and Power Interface) — which controls power management and hardware communication. When you're stuck in a boot loop like that, it typically means Windows can't boot because the BIOS isn't providing compatible ACPI support.

Power Cycle the System

Just in case this is temporary corruption:

Turn off the PC completely.

Unplug the power cable (and battery if it's a laptop).

Hold the power button for 10–15 seconds.

Reconnect and power it back on.

Enter BIOS/UEFI Settings

You’ll need to make sure your BIOS is properly set up.

Restart your PC and enter BIOS/UEFI settings.

Once inside:

Reset BIOS to Default settings

Boot to Windows Recovery (WinRE) or USB Installer

You may need a bootable USB drive:

If you already have a Windows 10/11 USB installer:

Plug it in and boot from it (change boot order in BIOS).

On the Windows Setup screen, click:

Repair your computer > Troubleshoot > Advanced Options

Try:

Startup Repair

System Restore (if available)

Command Prompt and run: sfc /scannow chkdsk c: /f /r

If you don’t have an installer:

You can create one from another PC:

Go to: Download Windows 10

Download the Media Creation Tool and create a USB installer (8 GB+)

I hope this helps.

Please feel free to reply here if you have any questions or if you need further clarification on any of the steps. 

Take care and have a good day. 

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Regards,

[Red012]

I'm having the same issue, but all steps that I've read so far have not worked properly. All tests have passed and Bios has updated twice, and still getting message. I have an HP notebook. 

[Fe7561]

@redbird506 i have the same problem, but i can't understand if i need install the same API versión? or a new API version?

laptop's specs:

HP PAVILION ab-126la (p0e23la)

Processor: AMD-A10 8700P

v.BIOS: AMI F.54

[Garp_senchau]

Thanks for reaching out! I suggest you reach out to the nearest HP Authorised service center for personalized assistance. They can provide one-on-one help to fix the problem.

Note: There might be a nominal charge for the service they provide.

HP® Service Center Locator - United States | HP® Support

Regards,

[Flinsy]

No sirve.
Lo hace sin disco e iniciando desde un pen drive.
Y si el disco está conectado, inicia desde pen drive y luego intenta iniciar desde el disco.
Solo lo solucioné quitando inicio seguro desde BIOS.
Y actualicé el BIOS a la versión F.54.
Parece un problema de las notebook Pavilion con procesador AMD Ax.

[tk_srq]

@RedBird506,

See this thread where the folks who experienced an ACPI BIOS error on their AMD processor-based notebooks were able to boot into Windows back again after trying DGroves' suggestion (hide TPM). 

Solved: Re: have acpi bios error - HP Support Community - 9426518