Hi Jon
Someone in WAMUG gave me the answer to the loud fan problem a while ago and it 
works.  As soon as you press the start button, if the fan is loud switch off at 
the power point and then start again. I don't know why it works. Try it.
Cheers
John
On 30/03/2011, at 11:56 AM, Jon Davison wrote:

> 
> Hi there. Our office has a new 27" iMac. All fine except a fairly loud fan 
> that comes on pretty much at any time. The fan stays on but does not increase 
> in volume. Nor does it heat up or freeze.
> Any idea what  this may be? is there a reset for this?
> 
> 2.66GHz / 4Gb RAM / OSX 10.6.7 / 1Tb
> 
> Kind regards
> Jon
> 
> 
> 
> 
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