To see if you’ve got a process or app that’s causing the fans to kick up, first go to the magnifying glass in the top right of your screen and search ‘activity monitor’ open it and click the CPU tab and in the CPU% column you will get a read out of all the apps and processes being carried out by your iMac and the amount of computing power they’re using.įrom thing you will be able to distinguish if you need to run certain programs individually with other apps closed and so on. This could be down to blockages in the fan outlet channels, broken heat sensors inside your iMac or software processes causing a lot of strain on the hardware. If your desktop iMac is making a lot of fan noise, something is causing your computer to get really hot.
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