Since yesterday I am trying to solve a problem I have with my iPhone firmware 4.0 jailbroken 4. After trying to solve one problem, in vain, I turn to you hoping to find help all started yesterday when I took my iPhone in hand and four that I found out. I try to restart, not possible, then I press the button and Home button ignition together for a while. Apple appears then remains blocked, then disappears. If I plug my Iphone 4 USB on my PC, apple appears and disappears intermittently. It is possible to put my iPhone in DFU Mode and Restore. Is there anyone else who is facing the same problem?