I got a Refurbished Dell Latitude D600 Laptop from ebay yesterday on Tuesday, September 26th 2017, It had Intel Pentium M (Non-Centrino) and Windows XP Pro SP3, but when i boot it up, it resets to The Default BIOS Date, can someone help me?
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The coin cell battery on the motherboard that keeps time while the system is powered off is probably dead. Not too surprising given that the D600 is about 15 years old at this point. If you open the system up, it should be easy to find, so just note the type of battery, e.g. CR2032, and then buy that type of battery at any grocery/convenience store. Should only be about $2-3.
Forgot to mention that the Service Manual, available on support.dell.com, will very likely be useful in helping you open your system up properly.