Hey guys, I have had my S7 for a few days and am still learning the differences with my S5. I was mucking around with the selfie function and took a picture. I then clicked the bottom right to review the picture but it wouldn't respond. I got frustrated and locked the phone just as it decided to open. Then what happened was my phone would not unlock. It would not charge. It would not respond in any way when trying to turn the power on or off. I managed to somehow fix this buy holding power-home-volume DOWN button. A screen popped up warning me about installing other OS and to hit volume up to continue or volume down to cancel and restart phone. After hitting volume down my phone restarted and was back to normal. I have a feeling this was some error due to the fact I had a SD card installed and the pictures were set to save to that? But that is just a guess. It seems to be functioning fine now. I'm going to use this method if my Galaxy S7 is unresponsive again. Just writing this post to help anyone out. Let me know if it helps!