My clock keeps losing time, losing several hours over a 2 – 3 day period. What is causing this loss of time and how can I stop this from happening?
Computer Doctor: That is the first sign of a dying CMOS battery. When the battery fails, the data stored in the RTC/NVRAM (usually called CMOS RAM) chip will be lost. Most recent systems use a small coin type 3V lithium battery on your motherboard. Most use a CR-2032 which can be purchased virtually anywhere that sells batteries. To replace your battery, start by checking your motherboard to determine the battery type. Power on, access your BIOS Setup, print (via shift-prtsc) or write down the information on all of the menus. The most important data to save would be anything to do with the hard disk configuration. Power the system off, replace the old battery with the new one. Then power back up, run BIOS Setup, and check the settings to be sure all is OK; reset any information that has changed, including the date and time. Then reboot and all should be well.
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