A20 Line or 8042 Gate Memory Errors
Explanation: The system is detecting a failure trying to access the 21st address line, A20. This line is used to provide access to the high memory area, and is normally controlled through the keyboard controller.
Diagnosis: This is usually a problem with either the keyboard or the keyboard controller on the motherboard.
- Troubleshoot the keyboard.
- Troubleshoot the keyboard controller.
- Troubleshoot the motherboard.
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