Originally Posted by gmiaow
Had a go of that, it was 1.25 by default, but 1.0 made no difference so I've left it back to 1.25. Thanks though. I wish my monitor was more specific about what it thought was out of range, I had other ones which tell you what you are attempting to do.
I had that on my monitor at one point. To fix it I removed all other monitor drivers and left just HighGFX in devs/monitors and then (after selecting HighGFX 1024x768), I changed the config progam to 'use display timing from standard settings'.