Black screen after digitizer replacement

I am fixing an IPod mini for a friend that dropped it, cracking the screen. Upon putting it back together I tested it before sticking the digitizer to the frame. At first the screen lit up, but only showed fuzz/vertical lines. I pulled the battery connector to reset and checked my screen connections. All looked well so I plugged the battery back in. When I did this the screen lit up, but is solid black, though you can see it light up. There are absolutely no icons, just the lit black screen.