"Andy Burns" wrote in message
...
NY wrote:

It only affects the VGA (D-Sub) output from the graphics card and/or VGA
input to my monitor.

Most monitors have an option to auto set the sync settings, tried that?

Sorry, forgot to mention that - yes, I've tried auto-sync. I also tried
changing a couple of sync settings in the ATI applet, but those also made no
difference.

I'll try connecting the PC to another monitor - I've an ancient 1024x768
monitor lying around somewhere - and see what happens. I'd try it with my
wife's monitor or our TV, but both of these only take HDMI input, not VGA.