Well, the scenario does occur, sry to tell you. I have had it happen to me before man. You are probably right though. That is more for when you put in a new GPU, and PS isn't adequate enough, and PC shuts down after about 2-5mins of running.
So anyway, hit F8/F3/delete/F10 at very beginning of startup to access that menu. My Comp is F8, but it could be any of those buttons (not a combination though) Try F8 first, then F3, then delete, the F10. One will work, and if not (that would be very strange...) then ask here again. I will walk you through BIOS for that. Anyway, GL trying that. and remember, safe mode WITH NETWORKING!!