I have a iPhone 3GS which is not turning up. I charged it for 2 hours and also tried connecting it with itunes. Neither works. The phone is completely down with a black screen and no detection in my my macbook or itunes. This happened second time. It actually happened to my previous phone as well 2 months back. I kinda misplaced that phone so don't care about it. But this one also came up with the same issue. Need help badly. FYI, I am using the same simcard slot in this phone (which I used in my previous one). Should that be creating any problem. I already tried the hard reset. HELP! URGENT HELP!