Snow on 30" ACD when running from MacBook Pro 2.4 with Leopard....HELP

OK I have tried to run a 30" ACD from a high res MacBook Pro and at first everything appears fine. But as time progresses snow effects start to appear on the large monitors screen. I am running the laptop with the monitor window closed so that everything is on the large monitor.
I had previouslt experienced this issue with my G5 tower and I had to resort to SwitchResX and run the monitor at 58Hz. This time however the graphics card in the MacBook Pro does not allow the refresh rate to be changed. Tried doing as a custom refresh rate and even that does not work.
Has anyone experienced such an issue when running a 30" ACD at max resolution?
What can I do to fix this?
Regards

I want to chime in as I'm having the same problem, although my hardware specs are slightly different... I'm running a 2.33Ghz 15" Macbook Pro with the ATI Radeon X1600 video card (256MB ram), running Leopard, with a brand new Dell 30" 3007WFP-HC monitor. (didn't have the LCD before I upgraded to Leopard, so don't know if the OS is a factor)
I see the snow appearing as horizontal one-pixel tall lines which appear alone or in a group of less than 10 appearing near each other on the screen - and it appears to be intermittent and only visible against black or very dark backgrounds. I tried the above suggestion and set the resolution down from the LCD's native, and wasn't seeing the interference, but switched it back and wasn't seeing it at native rez either. I'll have to try this rez switch the next time I see the interference, because it does not appear all the time.

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