Its not the power supply that you have to worry about. Even if you walk across the room, you build up static energy in your body. As far as I know, the motherboard has sensitive capicitors that, if you touch, go haywire and malfunction, resulting in a defective product. The static energy is mroe than enough to fry the capicitors. I think this is also the reason you have to wait 7 secs or w/e to turn your computer on again, after you turn it off; the capicitors need time to discharge.