How to fix Asus motherboard error code 40?

Alton Alexander
By Alton AlexanderUpdated on June 4th, 2022

The asus motherboard code 40 error indicates that the system has attempted to access the BIOS from an unauthorized location. This error can be caused by a variety of factors, such as a corrupted BIOS, a faulty motherboard, or a mismatched BIOS and motherboard. In most cases, the code 40 error can be resolved by flashing the BIOS or updating the motherboard firmware.

Users typically search for a solution by asking about:

  • asus error code 40
  • asus motherboard code 40

1. Clear the BIOS settings and try again

  1. Boot your computer from a CD or DVD.
  2. At the main menu, choose "Startup Settings."
  3. Choose "Restart."
  4. Press F10 to enter the "Boot Options" menu.
  5. Choose "Advanced Options."
  6. Choose "Restore Default Settings."
  7. Press F10 to continue.
  8. At the "Device Manager" window, choose "Universal Serial Bus controllers."
  9. Right-click the "Asus P5G41-VM motherboard" item and choose "Uninstall."
  10. Follow the instructions that appear to restart your computer.

2. Update the BIOS to the latest version

  1. Download the latest BIOS update file from asus website.
  2. Install the BIOS update file.
  3. Restart your computer.
  4. Post the result of the BIOS update on the forum.

3. Try a different processor

  1. Check if the processor is compatible with the motherboard.
  2. Check the motherboard documentation to determine how to change the processor.
  3. If the processor is not compatible, then replace the motherboard.

4. Try a different memory module

  1. Locate the memory module in your computer. It is likely to be on the motherboard, in a narrow slot or on a bracket.
  2. Remove the old memory module. Be careful not to touch the contacts on the module or the pins on the motherboard.
  3. Install the new memory module. Make sure that the pins on the module fit into the slots on the motherboard, and that the module is oriented the right way.
  4. Reconnect the power supply to the motherboard and test the memory module.

Some users might also have success with the following opitons:

  1. Try a different video card.
  2. Try a different hard drive.
  3. Try a different optical drive.
  4. Try a different power supply.
  5. Try a different motherboard.