blank screen

I had a buddy who fixes phones do my screen & after he replaced it he plugged it in to see if the screen worked before setting it in, it showed the charge battery symbol and died and neither new or old screen or ringer has worked since and I had been password locked out but it pops up when I...

IOS 9.0, 9.0.1, and 9.0.2 on iOhone 6S. When opening apps they start then go to blank screen. Press home then restart app and it works. This occurs on nearly every app. Hard reboot of phone makes the problem go away for a few hours, then the blank screen comes back. When the screen is blank I...