Thanks to all mates who kept my spirits up to go on tracking the culprit down
Finally found the bad one that messed the graphics up - a corrupt GPU driver...
Never ever before I've had something like this.
Could be useful to know that the latest nVidia driver 320.18 seems to be anything but reliable.
At least for me and my my GPU Geforce GTX 770
Thanks again to all of you, now I'm off to learn about all the new goodies in this latest Parts Magui
