Hi thanks

I kinda figured it out in the end. When I thought I'd swapped the screens around, I'd actually only mirrored them. It worked while ever I had my apple - vga adaptor connected to the rear of the machine, while the monitor was plugged in to the ATI rage. I guess the onboard video port, thought the adaptor was actually a monitor.

Everytime I unplugged it the vga out on the rage would go weird. Finally realised I needed to move the menu / task bar over to the other desktop, so that it became the primary display. Lord what a faff!! That was more stress then rebuilding the thing!