Late model iMac fan noise

Hi..
There seems to be many threads on this topic but I seem to be making headway on fault finding.
We have 3 late model intel iMacs (all with SMC).
All have been very quiet until recently when mine started running with fans at sometimes full speed.
I think I have tracked it down to only doing it with a high drain device in the USB port. Namely an EyeTV hybrid. I have it plugged into a Logitec powered hub. It seems that whenever the stick is plugged in it doesn't take long before the fans start up. After removing the stick.. after a little while the fans begin to slow down and eventually stop all together.
I'd be interested if anyone else out there can duplicate the issue wheter it be with an EYE TV stick or anything else.
Cheers

OK.. so its seems that it was incidental about removing the eye tv stick as the problem has returned.
I do believe this time that I have a better understanding of what is going on for me at least.
I installed "temperature monitor" to keep an eye on what was going on. The problem appears to be with the CPU A sensor. I just this moment woke my machine up and shortly afterward the fan started. I looked at the temps and the CPU A sensor read 127 C which was obvious rubbish since it had been asleep in a low ambient room. I suspected a bad reading from a bad connection or sensor so I tapped the machine on the back a few times (not too hard) and the reading returned to 33 C and the fan stopped.
My problem now seems clear (I must have bumped the machine when removing the EYE TV stick the first time leading me down the garden path a bit).. maybe this will help others.

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Well, sounds like someone filled your head with a bunch of nonsense and now you're really more upset with yourself for believing such obvious nonsense, and not so much Apple or anything else.
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Good afternoon from Spain,
I have a iMac (late 2006) and during the last weeks, it's beggining to make a very strange noise.
The noise: http://rapidshare.com/files/170755323/Ruido.m4a.html
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Message was edited by: luismerce

Hi Luis
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http://support.apple.com/kb/HT1543
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Late model iMac fan noise

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