Connect iPhone to the Wall Charger for 10 minutes, the iPhone may turn ON itself. If still OFF, keep on the Wall Charger and Reset, hold both the home and power buttons for about 20 seconds until the iPhone begins to start.
any anwer to this. Just got 7.0.3 and I got the black screen. Holding down the power button does not reset. I'm trying to do a backup but nothing works, so I'm hosed. APPLE????? iPhone 4 (waiting for the 6)...run down the battery so it restarts???? some help please