SmcFanControl needs to be started to work - it does not run as some kernel extension or Launch Agent (last time I checked it, which wasn't too long ago). It's one of the smaller cables you usually disconnect to take the LCD off. If the CPU or optical drive fan is spinning up over 2.000 RPM then it's actually the LCD sensor that is not properly connected. If the hard drive fan is spinning up to the max there is nothing you can do about it other than using smcFanControl to limit it's maximum RPM (within reason, 1.200 is a good value from my experience). Within OS X check the fan speeds within smcFanControl. Now, perform an SMC reset: unplug the power cable, wait 15 seconds, plug it back in, wait another 5 seconds, turn it back on. Once that is done start the iMac back up and shut down again. I assume the late 2009 model already has the sensor that is connected directly to the hard drive? In that case the best way to go is to disconnect the cable entirely. ![]() ![]() smcFanControl is pretty much the go-to tool in such cases. ![]() ![]() In the man page for powermetrics on 10.14.4, I see the following under the Output description section: 'SMC: The smc sampler displays information supplied by the System Management Controller. Honestly, I haven't heard of either of these applications. powermetrics does take a few seconds to generate the fan speed, so let it run until it samples the SMC.
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