Here's an update on my monitor problem. It was suggested I check for pots and particularly ones labeled horizontal adjustments with the idea in mind that the pots had dust inside and working them back and forth would clean them. Since this monitor has push buttons for on screen adjustment of horizontal size and position I simply worked them back and forth from one extreme to another several times and it's fixed.
I'm familiar with potentiometers and variable rheostats but don't know much about how these relatively new electronic circuits vary resistance ... or why this technique also works with circuits but it's a common trick that works with most anything. I remember reading a guide about how to purchase cameras that suggested rotating the lens and all dials completely through their ranges while paying close attention to any sticky spots or clunks. Ideally it should be smooth throughout the range of operation.
Another thing that helped the jumpy monitor screen was bumping the screen size from 1600X1200 to 1920x1440 and leaving it there for awhile.
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