:D Thanks guys, You were right about the graphics driver. However, I'd installed the new drivers (before you'd posted the link) and it all went tits up! The graphics driver didn't work, things went very bad, all kinds of nasty stuff happening, things crashing and not restarting... etc. So I got rid of those drivers and tried an older Nvidia driver and fortunately it worked. Which was a good thing, I don't know how much longer I could have coped with 640x480 and 16 colours! Anyway, it all ended well. Cheers. LB