I HAVE TIS NOISE IN MY IMAC AND IT DOES NOT SOUND LIKE THE FAN BUT A SWOOSHING FRYING SOUND THAT LASTS FOR ABOUT 3 SECONDS BUT NOT EVERY TIME I USE THE IMAC.  LIKE THIS TIME, I'M ON IT FOR 45 MIN. & IT DID NOT HAPPEN. ?? WHAT IS IT ?

I have had this imac for one year and 2 mos.  recently I hear a swooshing noise like speakers are frying when I power up and again intermittantly which lasts about only a few second and quiets down by itself. I have mt portable DVD drive unplugged, I turn down the volumn on the imac but it makes no difference.
I don't have applecare so I guess I should take it to the local apple store in Santa Monica ffor them to check it out.  But it could be that it wont do it when you expect it to happen ???
Is anyone familiar with this sound ?

Could it be the hard drive making this noise?
Or could it be the fans?

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