I had a newly-repaired (warranty repaired) machine until I did a bios update and pro technicians want $200 just to look at it. First I had just a blank screen that I was able to workaround seeing on an external screen but when I tried the F5, lost that too. I've tried various F keys. I've read to reset the bios on my Toshiba p15-S479 Satellite and to do so I should short the terminals of the bios chip. This is rather vague and I am unable to find the bios chip or a schematic. Any help here for a do-it-yourselfer?

Added info - My laptop unexpectedly restarted while upgrading BIOS and at first would not boot at all. I tried several times and the screen remained blank although it was on and my senses told me it was just the screen, which is why I tried an external screen. The external screen worked until I started playing with the F5 and other keys trying to get the laptop screen to work. I cannot find a key combo to get it back to the external screen either now. All is blank but power is on and I suspect all parts are good. Added info - My laptop unexpectedly restarted while upgrading BIOS and at first would not boot at all. I tried several times and the screen remained blank although it was on and my senses told me it was just the screen, which is why I tried an external screen. The external screen worked until I started playing with the F5 and other keys trying to get the laptop screen to work. I cannot find a key combo to get it back to the external screen either now. All is blank but power is on and I suspect all parts are good.