Yesterday I posted about the weird video artifacts I was seeing on my display.
On a hunch, I opened the case of my Mac Pro yesterday afternoon. Sure enough, dust was everywhere inside the case, especially on the video card. I gave a few blasts of compressed air to the video card (and surroundings) to clear the dust out. I powered up my Mac. The video artifacts that had plagued my system before were no longer there.
Flash forward 12 hours later, and my machine is still behaving. It would seem that the video problems have gone away. An article on Macworld seemed to confirm the experience.
Moral of the story: I need to clean the inside of the Mac more often.
-Krishna
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