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Fans have been spinning up and then spinning down recently. I have made some changes including two hardware changes, and I am hesitant to mention it because we will all go there, I have recently added a non Apple SSD to my iMac (I am glad I opened it up - the fan was filled with dust) I have also added a Thunderbolt Ethernet 10G adapter.

To Rule out hardware issues. I have run an Apple Hardware Test and it came back with flying colors:

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I reset PRAM, the SMC, rebooted in SAFE mode, and eventually reinstalled macOS.

I then went on to troubleshooting tools (TinkerTool, MacPilot) to remove caches, etc.

Finally, I ran defaults delete com.apple.finder

None of this has had an effect on the messages in the console or the fans random spinning up.

Looking in Console is a dangerous thing to do... since latest boot I have over 4000 messages like this;

cfprefsd Couldn't open parent path due to [2: No such file or directory]

Couldn't open parent path due to

How can the system not know where the defaults are for Finder or not be able to open them.

Looking in Activity Viewer

John
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    Did you replace a HDD with a SSD? If so, what did you do about the temperature sensor? – Gilby Oct 07 '23 at 04:03
  • @Gilby I replaced an Apple 512 MB SSD with a Samsung 1TB 980 Pro using a well regarded adapter. I guess I could remove it and see if the issue persists - it's the boot device though. I am wondering if during the process the 4 year old thermal paste on the processor may have lost good contact. – John Oct 08 '23 at 17:27
  • You need to say what model of Mac and what "well regarded" adapter. Otherwise go to https://www.ifixit.com and look at the instructions for your Mac. – Gilby Oct 08 '23 at 21:57
  • @Gilby [2019 iMac] [SAMSUNG 980 PRO SSD 1TB PCIe 4.0 NVMe Gen 4] [Sintech NGFF M.2 nVME SSD Adapter]. Your source of information is ifixit.com? – John Oct 08 '23 at 22:57
  • See https://apple.stackexchange.com/questions/308179/after-re-assembly-imac-27-fans-blowing-at-full-speed-all-the-time A bit old, but temperature sensor issues after upgrades have always been an issue. – Gilby Oct 09 '23 at 22:26
  • The new nvme drive is sending temperature information. I can see it with smartctl. The older Mac’s required additional sensors built into the SATA cable from OWC - I own one. This isn’t the case anymore on the later iMacs. I’m still trying to narrow it down. – John Oct 10 '23 at 07:01

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