Please Help - Screen corruption while in Aperture - graphics card problem?

Over the past few weeks, I have noticed frequent screen corruption within the confines of the image that I am currently editing. The corruption only occurs when in Aperture. The corruption occurs as multiple thin (one pixel?) horizontal lines of random color and random length that occur in random locations within the image. If I force a re-calculation of the image (such as change white balance) the random lines will disappear, only to reappear somewhere else. The actual image (after export) is never corrupted, only the display. Recently Aperture has started to "hang" in random ways, sometimes freezing the whole machine, sometimes crashing, sometimes beach-balling.
This sounds like a hardware problem to me, but the standard Apple hardware test runs without errors, as does an extended memtest. Setup: Mac Pro, 5GB, SW fully updated to 10.4.11 and Aperture 1.5.6. I tried re-seating the graphics board to no avail.
Are there any programs that I can use to test the Radeon X1900 card?
Any other suggestions?
Thanks in advance.

Thanks David,
I did some more research and it appears that quite a few of us (unlucky) users with an early version of the Radeon X1900 graphics card are now seeing failures that appear to be due to poor heat dissipation by the graphics card. There's a huge thread on the subject here:
http://discussions.apple.com/thread.jspa?threadID=1195969
The problem with random display glitches doesn't show up for most people until they upgrade to Leopard, which puts a larger strain on the graphics card than Tiger. I am still running Tiger, but the glitches show up for me when using Aperture, which of course uses the graphics card more aggressively than most other programs. I assume that Aperture increases the heat which causes the glitches.
I tried cleaning the dust out of the Radeon's heat sink, and I added a tool (smcFanControl) that lets me manually override the default fan speed. By keeping the card's temperature lower, the glitches have gone away. If I let the temperature rise, they come back. Looks like I'll be needed a new graphics card.

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Please Help - Screen corruption while in Aperture - graphics card problem?

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