Turn the computer upside-down and to help prevent damage to the system board, remove the main battery before working inside the computer.
Remove the main battery: Slide the battery-bay latch release on the bottom of the computer and then remove the battery from the battery bay.
Remove the CMOS battery- loosen the captive screw on the RAM cover, and then remove the cover. Use a plastic scribe to slide into the guide on the side of the coin-cell battery compartment, and lift the battery out. When you replace the battery, insert it at a 30-degree angle under the clip with the positive (identified by a plus [+] symbol) side up, and then push it into place.
You BIOS password should now be reset.
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