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[ The PC Guide | Troubleshooting and Repair Guide | The Troubleshooting Expert | Troubleshooting Specific Components | Troubleshooting the Motherboard and System Devices | System BIOS ]

The BIOS settings in the CMOS memory have become corrupted or damaged

Explanation: The data stored in CMOS memory that controls the BIOS settings has become corrupted. This is usually seen in a warning or error message when the PC is booted, since the CMOS has a checksum value that is used to allow the BIOS to detect when the settings have become corrupted.

Diagnosis: The most common cause of this problem is the CMOS battery, which can cause erratic behavior if it is poorly connected or weak. It is also possible for other hardware or software problems to corrupt the CMOS memory, but this is unusual.

Recommendation: If you have created a backup copy of your CMOS settings then use them to restore the settings to the correct values. To find the problem itself:

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