http://www.dvxuser.com/V6/showthread.php?177130-HVX200P-Modular-Disassembly-(DIY-Photos)-To-Be-Cont
Next what you need to do is re-seat the ribbon cables on the top board. Then sure enough it powers on and off and the buttons work just fine! The ribbon cables to re-seat are white with a blue stripe in the picture below.
This picture shows the crud on one of the ribbon connectors. (Zoom in to see it better)
Here are my pictures of dissembling the camera.
The final results - lots of parts!