Scrambled Images Mac OSX 10.8.1

I have an early 2008 mac pro running the latest version of OSX Mountain Lion. My computer seems to be having problems rendering images. In aperture anything other than thumbnails are scrambled. I see this phenomenon with some quick looks images and also some webpage images (example attached). The example is a shipping label that still prints correctly even though it looks this way on my screen.
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strungConnect With a Mentor Commented:
Sounds like a hardware problem. Older MacBook Pros were notorious for video board problems. Run the Apple Hardware Test:
XaelianConnect With a Mentor Commented:
Do you have an i7 in it? Because a lot of users experienced this kind of issue with an i7. The only solutions is to take it to a genius bar, to replace the logical board ;).
aseismanAuthor Commented:
This is a 2008 Mac Pro with dual quad core xeons. After a restart the problem seems to have gone away but it seems very strange and am wondering if it is a potential sign of a hardware problem. I was unable to run the hardware test. When I held down "d" it did nothing during the restart. I put in an old snow leopard install disk and tried the same, also did not boot from the disk. Could Mountain Lion on an older computer have made running the hardware check impossible?
You need the original installation disk that came with the computer to run the hardware test.
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