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I've been dinking with the xorg.conf file on my system and now when I try to start X I get a flickering effect and no usable image. I think (and this is just a guess) that it's a settings out of bound error of some kind but I don't know what setting. I'm almost completely sure that the hardware is good given that everything is brand new and works just fine in text mode. (HP LP3065 flat panel if that makes any difference)

Any ideas?

More information:

If I remove the xorg.conf file, the original problem goes away but the monitor shows off center and with corruption around the edges. If I just comment out everything in the file, I get the original problem back.

A little spulunking show I'm using a Quadro FX 580. If I switch to a different monitor (24" with lower res) things work.

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Is your monitor a CRT? – Earlz May 7 '10 at 20:37
flat panel LCD. – BCS May 7 '10 at 20:48
i got heavy flickering when trying to log into two xservers on the same hardware (laptop LCD, ati mobility radeon, one user into Xubuntu session and a different into Ubuntu/Gnome session, Ubuntu 10.04). thre are a lot of different variables that come into play and troubleshooting gets ... complicated. – quack quixote May 7 '10 at 23:32
Sorry not a Linux user so excuse my ignorance... is this not a screen resolution issue? that's why it goes away with a different monitor; try reading the manufactures recomended refresh rates to see if you can set your video setting to that of the monitor. Possibly your .CFG file is setting the resolution/refresh to it's own parameters. Also try pressing the auto button on the monitor it's self this will fix basic/ reset to default which can help eleviate other issues /possibly. – Iceking007 Feb 18 '11 at 15:05
This behavior is sometimes caused when you insert a modeline manually or alter its parameters. – DrNoone Jul 5 '11 at 19:18

At a guess, I'd think you aren't outputting a screen resolution/refresh rate combo that the monitor support?

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