原帖由： Brad ,
Do the usual and start from the beginning. Reset, hold both Home and Power buttons until the iPhone begins to turn on, usually less than 20 seconds time. If nothing do the same while on Wall Charger, again Reset. If nothing, then with iTunes open, hold Home button and connect iPhone to computer, keep holding home button until iPhone is recognized in Recovery Mode, usually less than 20 seconds time. Then Restore iPhone. If nothing, perform DFU Mode Restore.