Hello, my 9 year old son dropped my pad on the corner near the power button. It made a slight dent in the metal frame, and now the button feels like it is stuck. The tablet only seems to turn on when I plug it in. The screen turns off after a while, but I think it might stay on until the batteries are drained. Has anybody had a issue like this, and how can I fix it without paying more than what the tablet is worth?