After updating bios blank screen
Generally, there is no mouse capability in the BIOS.Most all interaction uses the up/down arrows, the page up/down buttons and the ENTER key.
For many motherboards, you hit the delete key to enter the BIOS.
If you set it too high, your computer may become unstable, it may be unable to boot and/or it could overheat.
If you ever make a BIOS change that prevents the computer from booting, you can clear the CMOS memory with the 'clear CMOS' jumper.
That memory is used to store the values entered when you set up the computer's BIOS parameters.
This page shows some of the various setting and will tell, briefly what the setting affect in the computer's operation.