1. Disconnect the computer from any electrical source and remove the computer's side access panel. This may require the removal of one or more thumbscrews from the rear face of the computer case.
2. Locate the BIOS battery on the motherboard. This battery is most often located in the lower-right portion of the motherboard. However, motherboard design varies among manufacturers. This battery will be a solitary, circular, flat, 'button' type battery.
3. Remove the BIOS battery by gripping its sides and lifting away from the motherboard. If the battery does not allow for removal with your fingertips, use a screwdriver to gently pry it out of its housing.
4. Press the computer's power button to expend any stored electrical charge. This ensures that no charge is left to hold the BIOS setting inside the CMOS chip itself.
5. Replace the BIOS battery.
6. Replace the computer's side access panel and re-establish any previously severed electrical connections. The computer's BIOS settings are now reset to their default state. The computer may be booted into its operating system normally at this point.
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