A20 error.

Issue

A20 error.

Cause

Issue related to the keyboard or keyboard controller.

Solution

  1. Make sure the keyboard is connected to the proper port on the back of the computer.
  2. Turn off the computer and disconnect the keyboard and verify there are no bent, burnt or broken pins on the keyboard connector or on the keyboard connector on the back of the computer.
  3. Try a different keyboard on the computer.
  4. Unfortunately, if all of the above recommendations do not resolve your issue, the motherboard may have a bad controller and will need to be replaced.

Additional information

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