How to Erase a BIOS
Computer motherboard configuration settings and passwords are stored in a or complementary metal oxide semiconductor, or CMOS, chip that is powered by a small, usually coin-shaped, battery. BIOS settings are often changed to accommodate add-on hardware specifics and also to password protect BIOS settings and computer boot up. However, the custom settings may cause issues with other hardware or lock users out of the BIOS settings if the password is misplaced. Erase custom BIOS settings on a desktop computer quickly by removing the CMOS battery.
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Instructions
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Shutdown the computer and unplug the power cord from the power supply on the computer.
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2
Loosen and remove the screws, if any, that secure the service panel to the chassis of the desktop computer. Unsnap the latches, if any, that attach the service panel to the desktop computer chassis.
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3
Locate the coin battery that is about a half inch to 1 inch in diameter and mounted to the motherboard. If the battery is shielded by a plastic cover, use a Philips-head screwdriver to loosen and remove the screws holding the shield in place. Slide a plastic, flat-head screwdriver underneath the coin battery and gently turn the screwdriver to pop the coin battery loose. Place one hand on the computer chassis and remove the battery.
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4
Wait 30 minutes for the BIOS settings in the CMOS chip to dissipate. Place one hand on the chassis and mount the coin battery back into place on the motherboard. Secure the battery shield onto the motherboard using the Philips-head screwdriver to tighten the screws.
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Place the computer chassis service cover back in place on the computer. Connect all latches on the service cover to attach the service cover to the chassis. Insert and tighten the service cover screws to secure the service cover. When you turn the computer on, it will boot into factory default BIOS settings.
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