Clear CMOS: Another method is to reset the BIOS settings by clearing the CMOS (Complementary Metal-Oxide Semiconductor). This involves opening up your computer's case and locating the CMOS battery on the motherboard. By removing the CMOS battery and waiting for a few minutes before reinserting it, you can reset the BIOS settings, including the password. However, keep in mind that opening your computer's case may void your warranty, so it's best to consult Dell support before attempting this method.