Power off the computer completely
Turn it back on
Immediately and repeatedly press the BIOS/UEFI setup key during startup:
Common keys: F2, F10, F12, Del, Esc
If a startup menu appears, select “BIOS Setup” or “UEFI Settings”
Wait for the BIOS/UEFI screen to load
Make changes only if needed
Save and exit (common options: “Save & Exit” or press F10)
If prompted, confirm the save and reboot