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I bought a brand new iMac mid 2011, and from time to time I've get these artifacts. What could be the cause?

It looks like this when the temperature of the Graphical Diode = 77-80C, but when I was on Snow Leopard, I don't remember these artifacts. After upgrading to Lion, I can't work normally.

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migrated from stackoverflow.com Aug 13 '11 at 10:33

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I guess you should return it and ask for a replacement. –  slhck Aug 13 '11 at 10:45
1  
There was a recall on the 2011 27" iMac graphics card. See here: support.apple.com/kb/TS5167 –  chris Feb 8 at 20:19

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