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If you accidentally change a setting in the BIOS that causes problems, you can reset the BIOS settings to their default values using one of the following methods:

1. Load the default settings: Most BIOS settings have an option to "Load Default Settings" or "Load Optimized Defaults" that will reset all settings to their default values. This option is usually located in the Exit or Main menu of the BIOS settings.
2. Clear the CMOS: If the above option does not work or is not available, you can try clearing the CMOS (Complementary Metal-Oxide-Semiconductor) memory. This will reset the BIOS settings to their factory defaults. The exact method for clearing the CMOS varies depending on your motherboard, but usually involves moving a jumper on the motherboard or removing the CMOS battery for a few minutes.
3. Use a BIOS reset tool: Some motherboards come with a BIOS reset tool that can be used to reset the BIOS settings to their default values. Check your motherboard's documentation to see if such a tool is available and how to use it.

Note that resetting the BIOS settings to their default values will erase any custom settings you may have made, so be sure to back up any important settings before proceeding. Also, some motherboards may have a backup BIOS that can be used to recover from a failed BIOS update or other issues. Check your motherboard's documentation for more information on backup BIOS options.