That happened to me with my Note 2. I was at a mall talking to someone and walked into a half wall. I'm a total clutz! I had a Hybrid case on and a tempered glass screen protector. I walked into the wall with my phone in my left Pocket and banged hard enough to hurt my leg. My friend and I were going to a show and I was checking for the times, so when I pulled it out, the Screen was Black. Not one crack on the protector or screen, phone still worked, could turn it on and off, hear the sounds, but Screen went Black. I was p.o.'d to say the least. Best Buy wanted $150 bucks with their insurance, so I just put the money towards a new Note 3 when I was switching to AT&T.