I have the same issue, except I can't get the damn thing to come back on the screen no matter what I do. Plugged, unplugged, cmos battery removed and replaced, memory moved around, even HD unplugged. I'm going to try pulling the video card and reseating. This happened once before and I managed to get it, but I toyed with it for an hour today.
Kind of hard to turn off sleep when I can't get the computer to wake up to let me get to the options!