I took out some of the PCBs to reseat, and upon reinstall, there is no picture at all. First, it was all red, then I messed around some more, and now there's nothing.
I would take the whole thing apart. eject all the cards and unscrew the base board from the bottom. clean everything. pencil eraser on the contacts or contact cleaner. or wash the stuff, that's what I would do.
For future reference, my connection on my RGB interface had come loose. No doubt while I was taking the boards out. Tightened it up, and I was good to go.