I have a 3G. I uninstalled an app and went to AppStore to reinstall it. It told me it was already installed. I went to turn it off. The black screen came up with the spinning wheel. It did that for like 10 mins then the wheel just froze. I held both buttons to restate it. Now when I try to turn it on, I get the boot logo and it shuts off. I plug in power and it does nothing. No charging tone or anything. Any ideas?? I need to be back in to back it up. It's running 3.12 custom ipsw. Jailbroken. Never any issues. Help!!