This just happened to me. After an hour spent with tier II tech support, no progress.
You need to let the phone die completely. Once it's dead (and the blue light) is no longer dead, plug the phone into an OEM walk charger. In my situation, thanmy s7 edge would vibrate to recognize the charthen reset - before it could even build up a charge (so I thought). I left it alone for an hour or so, and amazingly, it booted up like normal.
Good luck!