ok, so after many painful hours, no more fingernails and less hair, the situation appears (fingers crossed) to be resolved happily… Turns out to be a driver problem, which looking above is where you were heading me. I’ve installed 67.22 at advise from Avid support forum wise one, and low ‘n behold, we appear to have a working system with my 6600gt card.
Thank you all for your suggestions. Been a steep learning curve, and a good exercise in logic and narrowing down the angles, but like to learn new stuff, so thats ok.
l8r…:)