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Fans needed to update sleep lite, why?

 
Greenhorn
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An update to dim the sleep LED at night runs the fans full speed while updating. My quiet iMac sounded like it was preparing for take off. Apple must have a reason for this, does anyone know?
 
Sheriff
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No idea what the reason might be, but you're not alone.

On the Apple iMac board, a user has reported that "During the [sleep light update] install your fans will run at full blast for about a minute. Then they will go back to normal and you will need to reboot again."

Ref: http://discussions.info.apple.com/webx?128@610.KyjNaVO7T4L.9528@.68b50323
 
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