unplug the pc from the wall
move bios jumper to reset
remove bios battery
wait 1hr-24hr
place bios battery back into holder
replace bios jumper to non reset position
plug pc in
pray to selected deity
push power
------------------------
some motherboards ( yes even current high end ones) require longer bios clears for reset if it gets borked
another thing to try is to use other pc to get the stuff to flash your bios which automatically resets it :)