I have a 16GB iPhone 3G and I just recently Blackra1ned. After everything was complete, I used AptBackup to try and restore all of my JB apps (probably not the smartest idea). After AptBackup ran, it "rebooted", but when it turned back on, it shut off again. Now every time I try and turn it back on, the apple logo appears for about 10 seconds and then disappears and the phone remains off. I have tried plugging it into my computer, but it continues to do the same thing. Please someone help me!!!!!!!!!