I have had my Surface 2 for a few months now and I have had no problems at all until today. When I hover the mouse over the battery it shows not battery is detected and I also have no sound at all. It is on mute and it will not let me unmute it and shows no speakers as well. I have tried to restart it and that did not work. I tried afterwards to reset my tablet and it is still showing that there is no battery detected and no speakers. Any advise on this would be greatly appreciated.