Many thanks to +Les Jenkins for his assistance in diagnosing what was wrong with my computer. Which, as it turns out, seems to be a a hard drive so frelled that it was actually interfering with booting up even when I had a bootable thumb drive selected in the BIOS to run.
So … a new drive appears to be in order. Which will then be a PitA to set up, but at least +Backblaze will help me restore my files, huzzah.
Below: me, using my work laptop for a Hangout with Les, who is looking at my BIOS screens. +Margie Kleerup thought this was hysterial. I had the ill-conceived notion of being glad that she doesn't do instant media, and the next thing I knew …
Margie Kleerup on Twitter: “Les and Dave try to fix Dave’s computer “
My wish would have been for one of your feline supervisors to have been looking down at you from the cat exercise platform in the background as well. 😉