Resetting from Within BIOSRemoving the CMOS Battery Resetting the Jumper Community Q&A This wiki How teaches you how to reset your Windows computer's BIOS (short for Basic Input/Output Settings) to factory settings.
You can do this on most computers from the BIOS page; however, if you're locked out of your computer's BIOS, you'll need to reset the BIOS by opening your computer's housing and removing the CMOS battery from the motherboard, or--in the case of desktops--resetting the jumper switch on the motherboard.
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If everything appears to be correct, you can try resetting the CMOS to the default values.
After the CMOS values are reset, save changes and exit the BIOS to reboot the system.
Make sure the computer is ready to be shut off before turning off the computer.
If you have a laptop computer make sure the battery is charged before disconnecting the power connection.
Enter CMOS setup re-enter all values and then save and exit CMOS setup.