Acer LCD fluttering with G5

I have a dual G5 2.3GHz with the GeForce 6600 PCI card. I have an Acer AL2016W connected. The display looked great for a few days, then after a reboot, the display was fluttering, trying to display two different views of the desktop, switching back and forth between the two. After many reboots and a few adjustments I learned that everytime I bootup, I have to switch the DVI connector to the other graphics port on the card. It doesn’t matter which port I am in, and it doesn’t matter what the display resolution is set. I called Acer, and they put me through the paces, and the monitor works fine with a G4, and I put it on a PC and it works fine. They say it’s the G5. I put the LCD monitor on another dual G5 with the same fluttering results. Has anyone encountered this problem and found a solution?
G5   Mac OS X (10.4.7)  

Well, after about an hour or more with apple support, we have found out that its not the G5. When I boot in safe mode, (hold the shift key down during bootup), I don't get the fluttering. I also called Acer tech support. The monitor works fine with the other makes of Apples I have here, (Mac mini, G4, G3) and works fine with the PC. So now its some software that's causing this problem. I'll post my findings, when I have an update.
G5   Mac OS X (10.4)  

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