In anyone experiencing loud fan noise for late 2012 27in iMac

I am getting a rattle sould like fan blades (as opposed to the whoosh of air) on my lat 2012 iMac.  Is anyone else having this issue.  It can be quite distracting.  Could it be a hard drive issue instead?

I have AppleCare cover so I will try to see if they do onsite repair as my nearest store is only about 2 km away.  As I was using the computer last night I heard three incidinces of really loud 'static' noise as well!?!  It went away each time but I managed to record the noise one of the times.  I have included the 'rattle' fan noise also in the links below:
Rattle sound
http://dl.dropbox.com/u/8407787/iMac%2027%20rattle.m4a
(the noise around 30 secs is a tram!)
Static sound
https://dl.dropbox.com/u/8407787/iMac%2027%20static.m4a

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