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0x000000A5BSODCritical

0x000000A5 — ACPI Bios Error | Blue Screen Fix Guide

ACPI_BIOS_ERROR

Windows 10Windows 11

What Does 0x000000A5 Mean?

The ACPI BIOS of the computer is not fully compliant with the ACPI specification, causing errors.

Real-World Causes

  1. 1Outdated BIOS/UEFI firmware
  2. 2ACPI BIOS not compliant with Windows requirements
  3. 3Corrupted ACPI tables
  4. 4Hardware not properly described in ACPI

Symptoms

  • ⚠Blue screen with stop code ACPI_BIOS_ERROR
  • ⚠System reboots unexpectedly
  • ⚠Possible data loss from unsaved work

DIY Fix

Beginner-friendly steps you can try at home

  1. 1Restart your computer
  2. 2Update power-related drivers
  3. 3Check power settings
  4. 4Run power troubleshooter

Advanced Fix

For experienced users and IT professionals

  1. 1Analyze minidump for faulting power driver
  2. 2Update BIOS/UEFI firmware
  3. 3Check ACPI compliance in Device Manager
  4. 4Test with different power supply unit

Frequently Asked Questions

What causes ACPI_BIOS_ERROR?
The ACPI BIOS of the computer is not fully compliant with the ACPI specification, causing errors.
Can I fix ACPI Bios Error myself?
In many cases yes. Start with basic troubleshooting like restarting, updating drivers, and running System File Checker. If the issue persists, advanced analysis of crash dumps may be needed.

Related Error Codes

0x000000A3ACPI Driver Internal0x000000E0ACPI Bios Fatal Error

About the Author

Windows Troubleshooting Team

Verified against official Microsoft documentation and real-world diagnostic data. Error behavior confirmed across Windows 10, Windows 11, and Windows Server.