On Dec 19, 12:37*pm, Jon Elson wrote:
This may be a bad video cable. *It could be reflections on the cable
bouncing back and creating the ghost. *It could also be a failed
termination resistor in the monitor, or a bad contact or broken solder
joint at the video connector.

Thanks Jon, after Xmas I'll swap the video cable for one from a
working
system and report, ... Peter E.