Jeff wrote:

If there are wire nutted connections these may need to be tightened. Be
careful and methodical and you should be able to fix the problem

Yes, this helped a lot. Since I didn't know for sure, I guessed to
possible ways of the wire coming in. Meaning, I had two possible last
good outlets. So I went to one of them, and it turned out to be a bad
connection in that.

Actually, it turned out to be a bad connection next to the GFI outlet,
which was still working. Who would've known that all the power to
my computers was actually going through the bathroom...

But in any case, it was a nutted connection, which was loose, so I
tightened it, and lo and behold, everything's working again.

I guess I didn't need an electrician to turn the screw.

Oh yeah, and thanks for the safety tips. I've been shocked enough
when I was young and curious and taking everything apart, that I
know I don't want that again.