I'm in a bit of a pickle.. I just tried to go and use my computer. I wake it and once my desktop pops up , I notice a strange black flash, now the screen is dark and the only sign of life is the sleep indicator light which is staying lit. Nothing is responding I tried holding down the power button, but for some reason I can't force it off, does anyone have any idea as to what else I could do to get it turned off? No drops, no spills nothing!