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iMac Intel 27" EMC 2309 (Late 2009, Core 2 Duo 3.06 or 3.33 GHz) ID iMac10,1, EMC 2374 (Late 2009, Core i5 2.66 GHz or Core i7 2.8 GHz) ID iMac11,1

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after harddisk change fan is working at max

change 1TB WD to a 2TB WD - same manufacturer so no problem, right?

but my fan is starting low and slowly increased till max.

did i install the sensor right - is there a possibility to do it wrong?

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You must have not placed the thermal sensors back into the new drive. re-connect the thermal sensors and fans will go back to normal operation.

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Known problem.

The wiring of Apple sensor connectors vary with the make of HD installed originally. These sensors may not work correctly on a different make of hard drive.

Best fix I've found is to install the free app smcFanControl

(might not work)

or pay $25 for hdd Fan Control


If your CPU fan is constantly running at full speed, as mine was, follow these instructions below:

Install smcFanControl

Go to the terminal and use these commands to regain control of your noisy iMac:

/Applications/ -k F2Mx -w 12c0

This will set the CPU Fan to max at 1200 rpm.

To revert to standard settings use:

/Applications/ -k F2Mx -w 3cf0

This will set CPU Fan to max at the default 3900 rpms

You might have noticed that the last 4 digits are the fan speed (in hexidecimal)

Other fan speeds you can try:

1100rpm = 1130

1500rpm = 1770

3900rpm = 3cf0



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larsp будет вечно благодарен.
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