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first remove the power and check the c mos battery for 3v if the battery have no voltage cange the battery also look for the jumber pins in your motherboard near the c mos battery and bios you will see two pins shorted with an juber move the jumber to the third pin normally the jumber setting are 1 and normal 2and 3 clear c mos
The c-mos battery does need to be changed, the outer casing should have a few screws "remove side panel" and that will expose the large motherboard, now! if you look carefully you will see a round battery that is shaped like a silver coin, remove it carefully and pay attention to the polarity + or - that way no mistakes are made when you install it. ( Before you begin unplug the computer)
Turn it over, remove the large cover in the middle. Those are your memory sticks. Next to them is a 3v coin battery.
Push inward slightly(you see the little fingers) and lift up the edge of the battery.
One of three places. 1- under the battery. 2- under a panel on the bottom. 3- under the keyboard. You're looking for a large watch type battery, some are in a pouch with two wires leading to a connector. Here's a couple of links for breakdown diagrams on different make and models. See if you can find one for your machine. http://repair4laptop.org/notebook.html