My tablet has just a white screen.

I got this tablet which is a Jazz Utratab 9.7 dual core tablet. I have had it for years and never took it out of the box till now. I charged it and all I get is a white screen. There is absolutely nothing on it but the white screen. I tried pushing all the buttons and turning it on and off and yet I still have just the white screen. Can anyone telling me what I’m doing wrong or what I need to do?