ACPI_BIOS_ERROR BSOD

What is ACPI-BIOS-ERROR?

Windows stops with ACPI_BIOS_ERROR (0x000000A5) during boot because the system BIOS is not ACPI compliant or has bugs.

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
• 2
  Disable advanced C-States and S-States in BIOS
• 3
  Boot with /NOACPI flag to diagnose: bcdedit /set {default} detecthal yes

Commands & Diagnostics