24" iMac purring

Hi, I've been having this none stop purring sound coming out of my core 2 duo iMac. It even purrs is sleep mode. This started the day after I wall mounted the iMac. I was very careful when mounting the imac following every instruction in the manual. The mount adapter does cover a third of the vent for the fan. I also ran the apple hardware test and it found no errors. Could this be just the cold weather? We just got our first cold font down here in FL.
iMac Core 2 Duo 24"   Mac OS X (10.4.8)  

Are you certain that it isn't a contact type of sound - something hitting something else, rather than a purring sound? There have been a couple reports that turned out to be the fan blades making some contact, and Apple fixed them.

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  • How do I move files from my iMac to my Airport without getting 'AirPort can not be modified' message. File sharing is enabled and I'm not getting asked for a password. Thanks

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    Yosemite is a big problem.
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