The wireless keyboard wasn't working. Oh wait - some keys were, some not.
So I searched the house for PS/2. This is the second temperamental wireless setup I've had, maybe all the other wireless things are interfering. Yes, there were my old gunged up ones, and they worked. Except - why was the mouse running round the screen on its own? Naughty mouse! Could it be... yes, it needed a different surface, light colors but not shiny.
So now all is fine, except for the sticky 'b' key and several unreadable ones that if I don't think my fingers can find by themselves.
Enough of this Mr Tesla, I'm buying a new set with wires.