Had this problem two days ago, dropped phone from height, then screen wouldn't switch on and back of phone got boiling hot, too hot to touch, called my insurance company next day put in a claim, i took the phone to the shop to drop off for repair and low and behold when the lady in te shop tried to turn it on, it turned on and started working again, been 15hrs since and no further problems, so my suggestion is just give it 12-24hrs then try switching on again.