Description sounds like fan noise to me.   Probably just needs dust removal, could need fan replacement.  The only other thing I could think of would be bearing failure, which could be a hard drive, which is infinity worse.

On 3/22/2019 10:54 AM, David J Brooks wrote:
Just tossing this out there to see if there is any solutions to my
strange problem.

A few months ago i started to hear noises in my computer room that at
first oi attributed to outside bird activity, upon closer
earzamination these noises were coming from my iMac. I get two types,
first one sounds like Canadian geese honking as they fly by and the
second is like someone blowing into a mike, that wind blown noise you
get if taping in a heavy wind.
I have tried rebooting and it still comes back. I have looked at
google but nothing that seems to relate

Any thoughts on this one.??

Dave

--
America wasn't founded so that we could all be better.
America was founded so we could all be anything we damn well please.
    - P.J. O'Rourke


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