Hey guys, I'm having a problem that I can't fix.... my iMacs CPU fan, no matter the temp or usage is always running at 3900-4200 ... and it won't shut up... I can leave my computer idle, come back, see that the CPU is ~30°C ... but the fan is still wurring away. It is really loud, and really annoying. I've tried unplugging the computer for 30 seconds and restarting, I've reset the PMU... I'm not sure what to do next. All the programs I've found raise the default speed of the fan, but I can't seem to find any that will lower it, or at least change the threshold like you can for a MBP. any tips? Thanks!