Chosen Solution
this phone was dropped and suddenly turned off, it will not power on, it will not charge, but i can plug into pc, and it shows on itunes, while its on itunes the screen and phone look turned off, the vibrate flicker doesnt vibrate when silent is selected, no life at all. i restored the phone via itunes and it restored successfully, but once removed it is dead, no power at all, nothing displayed, no vibration and no LED. any ideas here? seems something has been dislodged from motherboard, any ideas what could cause this issue?
if it restored then it has power, i would shine a torch on the screen to see if you can see an image. if not try another screen. if none of that works chances are its a board issue