Thanks for the responses guys.
wasn't sure how to look up the graphic card. but after a little research I think it's an Intel(R) 82845G/GL/GE/PE/GV Graphic Controller. Does that sound right?
Rich, the hardware accelerator was enabled. The lines disappeared when I turned it off.
Gaieus, the lines would "highlight" or turn blue with the rest the connecting points when I double clicked a connecting surface but I couldn't select them by clicking on them specifically. The cut and paste into a new window didn't work as desired.
jgb, I've seen the invisible lines before, these were something else. They weren't dotted and seem to be very random. but I didn't know about the hidden line feature.
Mitcorb, I did scale up the entire model recently. That everything looked fine when I saved it and closed it down. It was when I reopened the file later in the day when these lines showed up.
So, for the time being, turning off the hardware accelerator made them go away. Just for the fun of it, I turned it back on to see if the lines came back. They did not. I spun the model around a bit, zoomed in and out etc etc and they didn't come back. So, should I have my hardware accelerator on or is this something I should have off at all times when working with SU.
thanks again folks.