Hi, I fixed over 7 Iphone 6 before I ran to this problem: here's how I fixed it. In my case, I fixed an iPhone 6 for someone in a rush. Conected everything and tried to turn it on but NOTHiNG. Tried charging it, soft reset. I thought screen was defective. Took out plate and noticed one of the connectors was not in all the way. Pushed it in, reconnected battery and voila. .. Check your screen connectors again. Be nice and gentle