Apparently the power supply on my desktop has conked out. (The monitor kept turning off, and I discovered that the back of the case was really hot and one of the fans stopped working.)
I can’t fix it until next week because I’m leaving Thursday a.m., going away for a couple of days to the land of sunshine. Thank heavens I have a laptop from C&L, but it’s a pain in the ass to type on one for an extended period. Oh well!