Resetting your BIOS (Basic Input/Output System) or UEFI (Unified Extensible Firmware Interface) restores all settings to their factory defaults. This process clears any custom configurations, including overclocking profiles (like EXPO and XMP), manually enabled features, and even reverts the time and date. Restoring factory settings can often resolve boot issues and undo unwanted changes. This guide explains several methods to reset your BIOS/UEFI.
Note: While modern PCs typically use UEFI, the terms BIOS and UEFI are often used interchangeably, and this article follows that convention.
Saving BIOS changes in Asus. DigitalTrends
Resetting Your BIOS/UEFI Within the Interface
Every BIOS/UEFI interface is unique, but they all provide a reset command. This option might be labeled “BIOS Reset,” “Factory Defaults,” “Default BIOS,” or something similar. The function is identical.
Step 1: Access the BIOS/UEFI Setup Utility. Power on or restart your PC. During the initial boot sequence, press the designated key to enter the BIOS/UEFI setup utility. Common keys include Delete or F2, but this can vary depending on your system or motherboard manufacturer.
For more details on accessing the BIOS/UEFI, consult your motherboard manual or refer to our guide on using the BIOS.
Step 2: Locate the Reset Option. Within the BIOS/UEFI interface, typically at the bottom or right side of the screen, you’ll find navigation keys and commands. Look for the option to reset to default settings. Consult your motherboard manual or manufacturer’s website for specific instructions if needed.
Step 3: Execute the Reset. Press the designated key to initiate the reset. You might see a list of affected settings. Resetting to defaults can alter numerous configurations. If you want to retain your current settings, explore the option to save them before proceeding. When prompted, reboot your PC. If not prompted automatically, manually save the changes and restart. Your BIOS/UEFI should now be reset.
Using the Reset Switch (If Available)
Many modern, high-end motherboards feature a dedicated BIOS/UEFI reset switch or button. This may be located on the rear I/O panel or directly on the motherboard, requiring you to open the computer case.
Consult your motherboard manual, the manufacturer’s website, or visually inspect the board for the labeled switch. With the PC powered off, press and hold the reset button for a few seconds. Refer to your motherboard documentation for the precise duration. Afterward, power on your PC, and the BIOS/UEFI should be reset.
CMOS battery on an MSI motherboard. Anirudh Gadgil / Unsplash
Resetting the BIOS/UEFI by Removing the CMOS Battery
The CMOS (Complementary Metal-Oxide-Semiconductor) battery is a small, button-cell battery on the motherboard that powers the BIOS/UEFI when the system is off, allowing it to retain settings. Removing this battery can reset the BIOS/UEFI.
Step 1: Prepare Your System. Power off your PC or laptop and disconnect the power cable and/or battery, if applicable. Open the computer case to access the motherboard.
Note: For laptops, this may involve removing multiple screws and other components. Proceed only if you’re comfortable with the process and aware of any warranty implications.
Step 2: Locate the CMOS Battery. The CMOS battery is typically located near the center of the motherboard, but its exact position can vary. It might be situated under a graphics card or behind a heatsink. Refer to your motherboard manual if needed.
Step 3: Remove the Battery. Press the small retaining clip securing the battery and carefully remove it.
Step 4: Drain Residual Power. Press and hold the power button on your PC or laptop for approximately 30 seconds. This discharges any remaining power from the system’s capacitors, ensuring a complete power cycle.
Step 5: Reassemble and Power On. Reinsert the CMOS battery and reassemble any components you removed. Close the case, reconnect the power cable, and power on your PC or laptop. The BIOS/UEFI should now be reset.
