You may be on to something -- I was running at 640x480, with only occasional trips to 800x600 for testing (which was when those pics were taken).
However, in setting up my new computer, XP insisted on bumping things up to 800x600, with no way to get back to 640x480 (at least, until I installed Multires). Unfortunately, this meant that the monitor was running at 800x600 for a long stretch.
The other thing that happened, however, is that I moved the monitor. Only about 10 feet into the gameroom, but it was movement, and that may have jarred something loose.
Basically, the monitor was working perfectly, then I unplugged it and moved it and then it was dead (well, not dead, but on life support.)
I'm curious about how long any D9200 owner has run this monitor at 800x600? Could that have been the cause?
Kevin