How to Reset a CMOS Chip
A complementary metal-oxide semiconductor (CMOS) chip sits in every computer system containing a basic input/output system (BIOS) which stores your date, time and system parameters. This kind of chip depends on a small battery that continues to feed it power after the computer turns off and no longer has power. So long as you have the battery in place, your CMOS keeps all your data intact. If you want to reset your CMOS, you just have to pull out the battery and leave it off for a while.
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Instructions
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Turn your computer around with the back facing toward you and remove all the cables connected to it.
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Remove the screws on the right edge of your computer holding the cover onto it.
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3
Pull back on your cover until it slides slightly and lift it off.
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Use a flat-head screwdriver to pry out your CMOS battery near the bottom of the motherboard. The battery appears round in shape and has a very metallic luster. Keep the battery off for about 30 minutes.
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Place the battery back into your computer with the flattest side facing out of the battery bay. Reassemble your computer and turn it back on. You'll now see a fresh new BIOS and CMOS configuration.
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