I replaced a cracked screen.....after connecting the new one and before closing up, everything showed up fine.....then all of a sudden, white screen. I plugged into iTunes but it was password protected. I actually punched in the code, guessing where the numbers would be and it worked! So, everything seems to be there in the white screen. I've tried 2 different screens with the same result. Quadruple checked connections, tried restoring and the hold the buttons method. Nothing but white. What confuses me is why it was fine at first then all of a sudden white screen. I don't think I did anything wrong....I've done about 8 repairs before without this problem.