alright, so originally, I went into my bios to make the notebook boot an Ubuntu 8.10 install disc, however, i got sidetracked and changed some settings i most likely shouldn't have, including the boot graphics adapter, and the overclock percentage.. now upon reboot, the screen remains off, the external d-sub connector works, but shows nothing on my external monitor, the fans briefly run at a high speed, then return to normal, and it just sits there, capslock/scroll-lock/numlock all light up their corrosponding lights, and all the touch sensor buttons light up normally..
I'm stumped, I've been digging through the internet for a few hours.. and have found some solutions for reseting bios settings blindly, but none have worked for me so far.
help?

EDIT: so, my question is, how can I reset the bios settings to default values without use of the screen?