I turned off the monitor earlier and then it wouldn't come back on.
I finally solved it by pulling the power plug on the tower for awhile and then plugging it back in.
I don't know why that worked but it did.
So, now I have a temporary solution.
The damnable machine was at the "doctor" today while I was at a doctor appointment.
He said it was now fine.
Just a loose connection, he said.
I'll leave that to you to determine where it was.
So I'm back.
Or I may be.
In the meantime, here's my old machine, vomiting its guts out.