How to Reset BIOS
All of a computer system's start-up processes are located in an area on the motherboard known as the BIOS, or Basic Input Output System. This area of instructions resides on a memory chip known as the CMOS. The independently powered CMOS and BIOS get their power from a small button cell battery. There are a few steps involved in order to clear and reset the BIOS.
Power the computer system all the way down. Remove the power cord and hold the power button in for a few seconds to clear any remaining charges.
Open the computer case by removing any thumbscrews or screws from the rear or side of the computer case. A panel will slide away revealing the inside of the case and the computer's motherboard.
Locate the small button cell battery held in place by a small arm on the motherboard. Gently remove the button cell battery from its location.
Look for a set of jumper pins near the button cell battery with a marking of "PASS" or "BIOS" stamped on the motherboard. There are three pins in a row connected together with a small black jumper. Typically the 1 and 2 pins are connected. Remove this jumper pin and connect to the other 2 pins. Wait for a few seconds and replace the jumper in its original location.
Place the button cell battery back into its original position and listen for it to snap back into place. Return the case panel into position and re-tighten the thumbscrews holding it in place.
Return power to the computer and reboot. The system may now ask for a password or to reset the password.
Tips & Warnings
- Replace the small button cell battery while the case is open. These are available at any retailer, such as Wal-Mart or Target.
- Clean the case while it is open. Blow compressed air into the computer case to dislodge any dust or debris.
- Never work on a computer case before discharging any static charges from the body. Touch the inside of the case to dissipate any charge.