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chscag

 
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Member Since: Jan 23, 2008
Location: Fort Worth, Texas
Posts: 39,662
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Mac Specs: 27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, 3 iPods, OS X Mavericks

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If the machine is new and you've just started using it, it's probably "Spotlight" indexing your hard drive. (An iMac has three fans: CPU, Hard Drive, and Optical Drive.) You could be hearing the CPU and Hard Drive fans both at the same time.

Once Spotlight finishes indexing, the fans should quiet down. If the noise continues, call Apple back.

Also, do not block the vents on your iMac. Cool air is drawn in at the bottom directly below the aluminum frame that holds the display and warm air is exhausted out of the top vent directly above the display.
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