After seeing yesterday’s post, a friend recommended that I pull the battery from my ThinkPad, hold the power button down for a few seconds, then put the battery back and see what happens. Well, that turns out to have fixed it. I’d never heard of that trick (or if I had, I’d forgotten about it). I searched to see if I could find any reference to it, and I found this SuperUser question. There’s not much information there, but heck, if it works, it works. So that’s one less thing I need to worry about today. Thanks!