I had the same issue with mine. I bought a new set of batteries charge them separately on a charger and then the device powered back on. Also, the batteries that were causing the issue where Samsung IMR 18 650 the light blue ones. They still work in other devices now which is fishy
Yesterday my Vapor Shark DNA 200 screen went dark the weird part is escribe does recognize it. And the screen comes on when charging but it will not function other than that. I've tried a soft and hard reboot. I've tried to contact Vapor Shark on the phone and email haven't been able to get through to them hoping there is something I can do to bring my baby back to life