ACPI_BIOS_ERROR BSOD

What is ACPI-BIOS-ERROR?

ACPI_BIOS_ERROR BSOD ranks as a critical-severity system driver issue in our database. Windows stops with ACPI_BIOS_ERROR (0x000000A5) during boot because the system BIOS is not ACPI compliant or has bugs. Use the steps below to track down and fix the cause.

Common Causes

• BIOS has a bug in ACPI table implementation
• ACPI features like C-States or S-States misconfigured in BIOS
• Windows update broke compatibility with BIOS ACPI tables

Step-by-Step Fix Guide

• 1
  Update BIOS to the latest version from the manufacturer

  This step, "Update BIOS to the latest version from the manufacturer", specifically rules out BIOS has a bug in ACPI table implementation.

• 2
  Disable advanced C-States and S-States in BIOS

  If earlier steps didn't help, "Disable advanced C-States and S-States in BIOS" directly addresses BIOS has a bug in ACPI table implementation.

• 3
  Boot with /NOACPI flag to diagnose: bcdedit /set {default} detecthal yes

  "Boot with /NOACPI flag to diagnose: bcdedit /set {default} detecthal yes" is the next step worth ruling out for ACPI-BIOS-ERROR.

Commands & Diagnostics

Frequently Asked Questions