What does 0xA5 error mean?

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BrandenRj97

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May 30, 2014
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I just bought a new laptop and since it was Windows 8 Before I downgraded to Windows 7, load it all up, everything runs great. I activated windows about 6 hours after I loaded Windows 7 and when I rebooted it, it got to "starting windows" and then gave me a blue screen with 0x000000A5 (add or subtract a zero).

I've looked at a few things and they said my BIOS isn't ACPI, what exactly can I do to fix this?

Laptop model: X551CAP
BIOS version: 209
OS: Previously Windows 8, currently Windows 7 64-bit

If there's anything else ya need to know hopefully I'll be able to answer.
 
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Nathan Willis

Nathan Willis

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Mar 15, 2014
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The ACPI_BIOS_ERROR bug check has a value of 0x000000A5. This bug check indicates that the Advanced Configuration and Power Interface (ACPI) BIOS of the computer is not fully compliant with the ACPI specification.

http://msdn.microsoft.com/en-us/library/windows/hardware/ff560114(v=vs.85).aspx

Update your BIOS.

Take out the CMOS battery and wait 10 sec.
That will default your MOB. There may be a rest button on the system too.

Make sure all of your hardware is compatible.

If the error does not come back, it may have just been a glitch.

Make sure all of your hardware is compatible with Windows 7.

Update all of your drivers.

A drive may be having problems.

See link:

http://acpibioserror.blogspot.com/2012/04/how-to-fix-stop-0x000000a5-or-stop-0xa5.html

It can even be a damaged file.

Windows restore should fix that.

http://www.nonabyte.net/0xa5-error-windows-7/
 
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