My tablet is about about year old. I was just on my tablet one night and it turned off. I had just plugged it in and it just turned off. I have tried to charge it with multiple chargers but nothing works. When i try to turn it on, the main logo just flickers on the it goes back to a black screen. When i try the hard rest nothing works. What can I do to turn it on and use it but not loose anything i had on their?