Okay so... Since this fix I've had thesame problem about 8 times again. I'm almost thinking it has to do something with the power button. I use an extension cord that you have to turn on before being able to use it... When I have it still turned on from the last run it will give me problems. Also, if I turn on that extension cord, and the power button from my pc after that (immidiatly) it won't work either, I would have to wait a couple of seconds... Sometimes it won't even work after that!
I doubt that it's a virus or software problem, think it's something from the inside.