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Occasionally my macbook pro (15-inch, Early 2011 with mountain lion 10.8.2) displays random garbled blocks. This happens on external Apple displays and the laptop display. See photo.

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Are you using gfxCardStatus by Cody Krieger? (If yes, update to the latest version.) – MacLemon Sep 29 '12 at 19:12
nope, i was able to restart my computer and had the issue go away. – tommy chheng Oct 15 '12 at 19:12

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