Well, it seems I did figure out what the problem was.
Apparently, my video card has been crazy, and has somehow forgotten how to switch resolutions. It just didn't want to display anything at any resolution apart from 1280x1024.
I found this out when I played FS Open at this resolution successfully (if a little buggishly), but couldn't get any other res to work.
More to the point, I found it out when I experimented and switched the overall resolution to 1024x768 on the desktop. Now I can't switch it back, because nothing is displaying on the screen and I can't see what I'm doing to switch it back. That res stuck when I restarted, too. I'm typing this message on a computer at work. :x
This effectively puts both HFH and my SideProject (TM) on hold for a while. Fortunately, that shouldn't be _too_ long, since I got a hand-me-down compy with acceptable specs from a family friend. (It was buggy and she got a new one anyhow, so, free compy! yay!)
Now I just need to get it set up, get a decent vid card for it, and find a decent way to copy a large number of files. (FS2 is safely on F-drive, which can be physically moved between compies, but there are plenty of things on C-drive that I want to save. Probably have to do the same, but with messing with jumpers in the process. Blah.)