[X4U] iMac CPU fan is 3000+ rpm (Found it)

[Paul Moortgat]

Forget the answer bellow.  It's solved.
I opened the iMac again and switched the connector (near the camera at the top) 180 degrees.
I must have mounted it the first time in the wrong position.
One must be careful to reconnect the connectors as they where.

Paul Moortgat


None of these works.  We'll have to live with it until we buy a new one.
A new 27" (i5) is more than twice as fast.

Paul Moortgat


On 12 Jan 2014, at 15:53, Andy wrote:

> 
> 
>> The WD drive I replace by a Toshiba drive is responsible that the CPU fan of our 2008 iMac is running at more than 3000 rpm.
>> 
>> 
> 
> One model of iMac (probably this one) had a hard drive with a built in temperature sensor. If you use a standard OEM hard drive the temperature info isn't getting through causing the fans to run at full speed.
> Using something like smcFanControl (free) or HDD Fan Control (about £21) which get the temperature info through S.M.A.R.T.
> I found HDD Fan Control to be better.
> 
> 
> Andy