Horizontal lines with Mac Pro 1,1 and ATI Radio X1900XT

I love my Mac Pro, I've had it since 2007. But recently, I have been having a video problem and I hope somebody here might have some advice or suggestions.
_The Problem_
Large horizontal lines going across the screen - especially when it is displaying quickly moving images. These horizontal lines move upward, as if trying to refresh the image. Examples: playing a video, scrolling down a webpage, rearranging windows.
_My computer setup_
I have a Mac Pro 1,1 with ATI radeon x1900 graphics card. I am using two displays, and experience the following problem on both displays. My displays are set up as follows:
*Display 1:* Acer H234H, uses male DVI to male DVI connection
*Display 2:* Panasonic TC-37LZ85, male DVI to male HDMI cord > HDMI coupler (i.e. 2 both sides female) > male HDMI to male HDMI cable
Both are using 1920x1080 screen resolution.
I don't think this is an issue with either of the individual monitors for 2 reasons:
(1) both of them do it
(2) the Acer has a very fast response time (2 ms) yet it also has the problem.
Suggestions, comments, ideas, and "hey me too"s are welcome and appreciated.

Thank you for your answer; I followed your suggestions:
The card is working fine in terms of spinning and is not dusty.
I booted from the Mac OS Installer DVD, and couldn't replicate the problem. But I don't think that's a good indicator, because this problem is intermittent and doesn't manifest itself consistently. Also, there's no way of playing video or scrolling down a webpage from the Installer DVD.
Also, I tried switching the two display connectors around (plug 2 to plug 1 and vice versa), which caused something interesting to happen: I stopped seeing vertical lines but started getting WEIRD flickering and green artifacts. Again, this happened on both screens.
The Apple Hardware Test said everything is fine (weird).
I think I'll try your suggestion of re-installing the OS. I always dread doing it. But hey maybe it'll make my computer run fast again (it's been running slowly lately).
Cheers, thanks for the suggestions, and I'll post back regarding what happens next.

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To all who are experiencing any of the frequently reported problems with the hardware/software combination listed in the subject heading:
I purchased the ATI X1900 XT as an upgrade fro my Mac Pro in January. I never experienced any issues with the card in OS X Tiger, but several months ago I began to experience overheating issues in Windows XP (Boot Camp) when playing graphics-intensive games. The overheating caused visible graphics corruption/artifacts, graphics system resets and even spontaneous system restarts. The frequency and severity of these symptoms actually increased over time, leading me to believe that the card was either defective or that the overheating was causing degenerative/cumulative damage to the graphics hardware.
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Horizontal lines with Mac Pro 1,1 and ATI Radio X1900XT

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