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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.
woozly
Posted 2011-08-13T10:00:37.477
Reputation: 141
2I guess you should return it and ask for a replacement. – slhck – 2011-08-13T10:45:26.843
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There was a recall on the 2011 27" iMac graphics card. See here: http://support.apple.com/kb/TS5167
– chris – 2014-02-08T20:19:21.817