> Everything _looks_ like it's configured correctly, as the server starts up
> with no apparent errors. The monitor, however, does one of two things:
> Either it displays "out of sync range" (tends to do that for higher
> resolutions, 1024x768 and greater), or it displays vertical stripes
> (640x480, 800x600). I suspected a sync problem, so I tried enabling
> sync-on-green, which didn't help. Under XF86 4, I tried forcing AGP 2X mode
> instead of 4X.
did you look at /etc/XF86Config if the modes it starts are correct to your
monitor?

check HorizSync and VertRefresh ranges and set according to your monitor
specs - after this X will remove all bad modes