Thanks for the response.

No, nothing works on the monitor at all.

But, I think I found the problem. It seems the connectors on the back are faulty or not connecting properly.

I can move them around, and the NAV unit senses the screen and turns it on. If i move the cable slightly, it turns off. If I dont touch the cables, it stays on.

However, once it is on, none of the controls work.

Rob