Question [Q] Samsung Glaxy Mega 6.3


just during today morning i was "playing" with my mobile. After a hour, not having ckeck it, i was to read my mails. It was just a black screen. I have tried turning it on.... >NOTHING<
Then i tried charging it. Not only it was not charging, but not even a led that usually lights on, gave me a signal that you know "i just need some battery!". Now it totally DEAD!!!
Does anyone know in order to help me what's going on?????