6/29/2023 0 Comments Smc fan control will not launch![]() ![]() Using smcFanControl and the terminal to set a MAX speed for the fan and writing scripts to start this after every sleep/restart.Fixes people have used in the past included: Resetting the SMC (System Management Controller) will have a temporary effect, but again the fan will speed up. If you replace your drive, your iMac will initially seem fine, but soon the fan will begin to speed up to full speed. When the iMac does not receive a good signal from the hard drive it puts the fan at full speed to protect the drive. Replacement drives do not contain the firmware to deliver temperature data on the temperature sensor cable. This is due to Apple replacing the external Hard Drive temperature sensor with a proprietary firmware and using the drives internal sensor. Since the late 2009 iMacs came out, replacing the hard drive has caused the internal Hard Drive Fan to start running at around 6000RPM.
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