[ The PC Guide | Troubleshooting and Repair Guide | The Troubleshooting Expert | Troubleshooting The System Overall | Troubleshooting Boot-Time Error Messages ] Errors indicating failure related to A20 line 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. Recommendation:
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