Just yesterday my Samsung Galaxy Note 10.1 2014 Ed. started acting weird. Now whenever i press main button the screen won't show anything. But tablet itself seems to be fully functional in anything else. I still can touch-unlock it, do stuff and hear responding sounds. But the screen is down. Then only I realized that the brightness is absolutely down by looking at the tablet as close as I can on light. Tried to regulate the brightness and check autobrightness. Not helping. Tried to reset device. Not helping either. And the thing is whenever I restart my Note the brightness comes back. And after first time I lock the screen with power button after restart the dark screen comes back. What to do?