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 plug it into my mac. What could be the problem? Maybe a fried motherboard if he didn't disconnect the battery and power down the phone before switching screens? Or does that not matter? Any help is greatly appreciated. iPhone 6 64gb