My rca viking pro tablet 10.1 turns on, white rca screen comes on, then viking pro, then the screen stays gray out and cant do anything. I can move the cursor around the gray screen when connected to keyboard only. I tried reset button. No success. I tried hard reset but it just turns on and on again the white rca screen. Need assistance fixing it. What is it? It was working great for months and then this happened 2 weeks ago. Help!!!