For those interested in a view of the PSU that was defective, see . I'm sure the view is quite a bit like the one that is currently in the PC.
For those wanting me to put a filter on the line, I bought a Radio Shack filter and tried it. No effect.
As I mentioned in some other part of this thread, note that if I plug the other computer in the room to the same room outlet as the PC with the new PSU that causes the noise, it too causes the same noise. Either computer in the room will cause the same noise when plugged into the same outlet, not just the one I originally discovered was involved. That is, one might conclude that it is the outlet that is the source of the noise, and not the PSU.
That's about as far as I'm going with this problem. It'll have to wait for another day.