i just got an iphone 4 yesterday from Optus. this morning i was playing with it and it was working fine then i put it down and when i went to pick it back up the screen was totally black and wouldn't turn on or do anything!!!!!!!!! i tried plugging it into the computer and nothing happened! i tried charging it nothing happened!!! CAN SOMEONE PLEASE HELP I WAS SO EXCITED ABOUT SHOWING MY FRIENDS AND NOW I AM DEVASTATED!!!!!!!!!!!!!! HOW CAN I FIX IT??????????????????