Received Android epad for Christmas gift and up until a week ago, was working great. I got books loaded and learning more each day. Then, I was reading a book at lunch break and got msg that battery was low. Ok. So I turned it off because I was at work not home and my charger was at the house. Since then, I have not been able to get it to turn on. I thought maybe it was the charger, so purchased new one. Not the charger. Now what???