RE: screen flicker: probably not X related

> I finally found the problem.
> 
> It was a 7.5V AC/DC converter. I moved it to a more distant 
> power point and 
> the problem has gone away
> 
> Perhaps someone else can profit from this somewhere down the line

Transformers, definitely something to watch, as they have significant
magnetic fields.  They'll do it every time. :-)