You'll need to open up the PC, then on the motherboard look for the coin type battery that says "CR20XX" Usually you can buy these at Walgreens for about $3 US. There is a little metal/plastic tab holding it in, the battery slides and pops out to the side. The new one slides in, make sure the words are face up (polarity)
Good luck.
Daniel Zee
June 2007
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