Sounds like a loose connection on the back
I just looked and couldn't find one. I would make sure ground circuit has continuity and power circuit has continuity. I bet it is something loose as well.
Crap. I guess I'll pull it off twice if I have to.
I had one that stopped working. There are 2 fuses that reference to the power adapter. One for the Power Port and 1 for the cigarette lighter.
Found a blown fuse