6 Beeps: Keyboard controller / gate A20 failure

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6 Beeps: Keyboard controller / gate A20 failure

Explanation: The keyboard controller is a chip on the motherboard that communicates with your keyboard. It also controls the A20 gate that provides access to the high memory area (HMA). This component is indicating a failure.

Diagnosis: This is usually a problem with either the keyboard or the motherboard.

Recommendation:

Troubleshooting the keyboard is relatively easy; try that first.
Troubleshoot the keyboard controller.
Troubleshoot as a motherboard failure.

Next: 7 Beeps: Virtual mode exception error

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