After a couple days of screwing around with the computer myself and then giving it to my computer guy, it turned out that the RAID/SATA controller had gone south. My computer guy worked on this all yesterday and was able to recover my C: drive (yaaaaaaaaaaaay!) and get it back to life. That was at 10:30pm last night and, even after a whole day of working on this, he only charged me $100. I'm enormously pleased.
I didn't have any way of running more than one drive and the DVD/CD, so I went out to buy a SATA card. Best Buy had one, their website said, but when I drove out to Springfield, they couldn't find it. Bugger. :( Springfield's to the east of Eugene. I drove first to the Office Depot in Eugene only to discover that they do sell SATA cards, but only online. I then drove to the far western side of Eugene and found what may be the only SATA card for retail sale in Eugene at a small computer store. It's slower than I wanted and was about twice as much as the same thing online, but I really NEEDED this card to get back to work. So I bought it, brought it home, and configured the computer. I'm alive again.
A much better (and slightly less expensive) card is coming on Saturday and then I'll hook the rest of the SATA drives up and do some more backing up. Meanwhile, I've deadlines that I want to get back to. And I really really really have had quite enough problems with electronics, technology, or ANYTHING for quite a while!