Black and white squares while logging off

when I log off and the "turning square" animation starts, the desktop background turns into rectangular black and white squares... has anyone else seen this? any ideas? this does not happen every time. it is purely random.
jamin

Yep. That's what they call "artifacts." In fact, it seems a textboox case of an overheating GPU:
"A common form of serious GPU artifact is a checkerboard pattern which covers the entire screen." (http://www.playtool.com/pages/artifacts/artifacts.html)
Do you hear the fan running? Try downloading an app like smcFanControl to speed up the fan. The noise you heard the first time could have been the fan going full speed OR the fan breaking --which in turn could have caused the logic board to overheat.
Placing the mini on a metal surface or on a laptop stand --preferably one with a fan-- may also help, at least for now.
Ideally, though, you should take the mini to the Genius Bar or an Apple certified technician.

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