HELP!! I am really worried, a few hours ago I was watching a DVD with headphones and suddenly the sound went funny, so I touched my iMac to see if there was something wrong with the static or something. As I did I go a shock, I touched it again and received the same shock, then I touched it for a few seconds and released it was actually a current (like electricity flowing through my Mac, not just static build up), I immediately turned it off (not with the power button because that shocked me too!!). After I turned it off I keep getting the same current through it until I turn the power off in the socket. It is definitely not static. I don't think it has anything to do with humidity either, or earthing because it was earthing fine until it just broke or something. I have also tried different power points but to no success... So what should I do? Should I be worried? Should I call apple? I just don't want it to explode and cause a fire!! Thank you!!