I bought a 3G Iphone on Craigslist. It would try open up on the Apple logo but would in 30 seconds die. So I installed a new battery. Thinking it was a bad one. Now it comes up with a skull and gear. I tried to connect to Itunes but nothing happens. Just like there is no cable. I went walking and after about 30 minutes of holding the power off key and home key, it turned its self off but immediately came back on to the Skull and gear. I tried tiny umbrella but it did not find it since it never connected to itunes. Does this mean he is dead and can't be brought back to life?