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Keyboard, keyboard controller or gate A20 errors

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). There is a failure somewhere in this part of the system.

Diagnosis:

 An error of this sort is usually a problem with either the keyboard or the motherboard, possibly specific to the keyboard controller.

Recommendation:

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