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[ The PC Guide | Troubleshooting and Repair Guide | The Troubleshooting Expert | Troubleshooting Specific Components | Troubleshooting the Motherboard and System Devices | CMOS Memory or Real-Time Clock ]
The system clock is losing time or not keeping time accurately
Explanation: The system clock is not accurate; it loses a number of minutes each day, or stops incrementing the time when the system is turned off.
Diagnosis: The most common cause of this problem is the CMOS battery, which also backs up the date and time so it isn't lost when the machine is turned off. A weak CMOS battery can lead to problems with the real-time clock even if the battery isn't weak enough to cause the loss of BIOS settings. Some motherboards apparently disable the clock as a power-saving measure when the battery voltage gets low. Of course, sometimes the problem with the clock is simply that it is inaccurate. As motherboards get cheaper and cheaper in both price and construction, the quality of some of these components gets very questionable.