My user process crash when I turn on the monitor

I have a Mac Pro 2009 with a radeon 4870 and a Benq V2400W LCD monitor (24") connected with DVI. Since about 8 month, or about the same time I upgraded to 10.6, I began to notice that a random number of user process crash randomly when I turn on my monitor when the computer was already running. (Like when I am doing something else and close the monitor but leave the computer on). For example, I turn off the monitor, go to the grocery, come back, turn on the monitor and see Safari, Dock, Finder, WebUIserver crash all at the same time.
At the exact time I turned the monitor on !
It very random. I can only see one application that crash, or I can see nearly all my user process crash. I never saw any kernel panic nor admin process crash and if I don't turn off and on my monitor, my computer never crash !
6 month ago, it wasn't a problem since it occurred like once per 2 or 3 weeks, but in the last month it occurred like 2 times a day.
I tried to : -Reinstall OS 10.6 over my current installation
-Reformat & do a clean install
-Reformat & install nothing except few app (iLife & iWork)
-Change my main HD
-Run Hardware test for hour and hours without any error
-Disable computer sleep, display sleep and HD sleep
-Pray Steve Job.
Since 5 day, it run fine but I no longer turn off my monitor. I just set the energy saving setting to 5 min. for the display and it work like a charm.
Since a display can only receive the signal from the video card, I doubt it can make my process crash. Can it be my video card that have a "wake up" problem or it a OS 10.6 bug ?
I have read hundred of Console lines, but nothing occur when I turn on or off the screen.
Thanks

It could be a problem with the video adapter, but there are other things to eliminate first. Does the monitor have a USB hub that's plugged into the Mac? Are you turning off the monitor with its power switch or are you actually removing power by unplugging the cord or turning off an outlet strip? Does it behave differently if you turn off the power using whatever method you haven't been?

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