Grey screen and no sound
A neighbour's son got his iPhone 4 trying to repair the earphone jack of his iPhone with a screwdriver. Something he did made the display go grey. When I tried to switch it on, I can see it starts, but the screen remains white grey, after a while if I tap the screen, there is some response, but since it is still the grey white screen I cannot see anything. There is no sound of start click or anything else. I have opened the casing to see if anything damaged but apart from the sign of the kid's screwdriver having gone through the earphone jack and damaged it, I do not see any other signs. I tried to hard reset with the home and power button, but no change. Could someone tell me, what could be damaged and cause this symptom?