No picture on the screen but iPhone 4 is on?
I have a iPhone 4 black GSM 16gb. I recently took it apart to place a new screen in it but now when i turn it on no picture in the old or new screen. The phone is on because the phone vibrates when the mute button is switched. I looked at all of the connection points for the screen and the digitizer but no defections. I have never had this problem with any iPhones before and i really need help with a solution.