Digital Noise - DVI Port 1 only

Last night one of the two Viewsonic VX910 monitors connected to my G5 went dark and would flicker on for less than a second (showing the correct screen) then blink out. Called Viewsonic and it's under warranty It was in port 1 of the built in AGP card that came with the G5.
Port 2's monitor looked good, so I plugged it into port 1. Anything black or very dark displayed lots of red digital noise - sort of like a TV tuned to a non-channel, but less so and the red noise is only against dark or black backgrounds. All other colors look fine..
Since port 2 was still fine, I assumed the video card was fried by the monitor. I installed a new card (Radeon 9600*) but got the same exact results!
I've run the hardware tests on the G5 from the install DVD. All passed. RAM is good, no discernible hardware failures, etc. Yet the problem persists.
Any ideas? Could the VRAM have gotten friend or corrupted? Or perhaps I might want to reset the PMU? Guess it couldn't hurt, but I don't think that could have done it.
Thanks in advance for any insights you might have.
* BTW, the 9600 card would only boot in Safe Mode. It was actually fine until I installed the ATI software. DUH! But apparently, that is a known incompatibility with some G5's - as mentioned in other threads here in the Apple forums.

In the interest of the discussions, I am posting the 'fix' for future campers with this problem.
I changed the refresh rate from 75 to 60 hertz and the noise is gone! I don;t remember setting it there but who knows what the viewsonic monitor decided it wanted to make it;s last request...

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Quote from: owcraftsman on 11-June-11, 00:40:06
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Do not dismiss the possibility that the problem may be with the TV. Based on what you have tried so far, an appointment at an Apple store genius bar is your best option. The evaluation will be FREE and then you should be in a position to make an informed decision.
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