Overheating event brand new 2020 iMac 27 inch 3.3 GHz

I’m on Big Sur currently and safari what is the browser I was using to stream some smooth jazz while I was gone.

just saw your replies early this morning as yesterday was my birthday. I have the app etrecheck, is it necessary to update to Monterey first? Or should I run it with the current system that causing the brief episode of overheating. Greater than 92°C for 10 seconds is definitely too hot, yes? The history from iStat Menus reprieve large spike for a few minutes and then back to normal again, after I assume the computer shut down and restarted automatically, as I have it set in system preferences.

Thanks so much for the replies from both of you! Best, Seth

I do have EtreCheck, and have uploaded results here once before, on one of my other iMac’s.

As the other persons stating Monterey addressed such a problem of overheating, but I have not heard this before. Should I update to Monterey from Big Sur, or run the check and upload results on the current system where the problem is occurring, so we might discover from the check what the problem is.

iStat Menus show the very brief spike from the mid to high 30°C, A brief spike just above 90°C and notices greater than 92°C sent from iStat Menus coming from every one of the six CPUs for more than 10 seconds, then assume the computer must’ve shut down and automatically restarted as set in system preferences. One my return home I was greeted with one of those a problem occurred with your Mac and shut down from some panic event and asked if I wanted to send the results of the log to Apple. I haven’t seen one of those in sometime. I might mention that I have not done anything to this iMac except to upgrade from Catalina to Big Sur. Best, Seth

Thank you so much for your very succinct and organized reply. It was my thinking as well to stick with Big Sur for now and see if I get another overheating event. It was very brief and seen as a short spike in iStat Menus’ history. And yes, you’re correct I have a new LaCie Thunderbolt 4. that connects to the 2020 iMac. The blue iridescent light blinking off and on intermittently, and I wander over to see what’s going on, but nothing is going on.

, I’ll wait and see how it goes and I’m wondering if I should return that drive as I just received it recently and can return it to Amazon. They G-Drive seems to be running perfectly without a hitch and it does not light up unless it’s being accessed. But LaCie keeps Lighting up intermittently without anything going on and I’m sitting watching TV.

Is there a known problem with this drive, or is it a problem with the macOS?

I can still return it to Amazon for a full refund.

Best, Seth

I did just set up the LaCie to be the time machine back up, so that explains its behavior. I have another LaCie on my 2014 iMac and it’s been working perfectly for the last eight years, never a problem and it’s connected to thunderbolt two. It’s not a time machine back up but use with LogicPro, and use a Seagate 8 TB for TM back up, which has been faithful, although for some reason I don’t have a lot of faith in it.

I’ll do the check on the 2020 unit sometime today, or I might wait to see if it repeats itself and perhaps it was just a fluke. It is a bit disturbing however, as I’ve never had a Mac shut down from overheating and restart and get about 40 warning from iStat Menus CPU 1 was over 92°C for over 10 seconds, CPU 2 was over 92°C for more than 10 seconds, etc.

Waiting for a day off, Monday so I can do the analysis. For now I have an overheating event on my 2014 iMac and it shut down. Again, 92°C for over 10 seconds relating to the CPU’s. I never had an overheating problem before even when the optical bay fan went out on the 2011 iMac for a few weeks before I got another one to replace it, it did not overheat. It seems when I installed TG pro, is when I started having these events. However I did use a Dyson vacuum to clean out as much dust as possible since it is over 10 years old, and I use some canned air to blow behind where the HDD drive, which. is behind her motherboard.

Is there any known issue with TG Pro which has an option to override the systems activity to increase fan speed which never changed on the 2014 iMac. It was always around 1200 RPM. I’ve always been using i-STAT menus for years, never an overheating issue. I’m wondering if I caused a problem vacuuming out the ports on the bottom at the back of the 2011 and 2014 iMac’s. I think I’m hearing there seems to be an issue with the 2020 iMac overheating? I’m not sure what I should do at the moment, but I can’t do too much until I have a day off which will be Monday. Why do thousand 11 iMac also had a shut down issue but it did not seem to be related to overheating, especially with three fans are functioning, except the hard drive fan seems to spend a lot of time at high 2000 to 3000 RPM, and in the past it was always around 1200 RPM. I use some canned when I had it opened up and some dust came out but not very much. I couldn’t get to the hard drive fan which apparently is behind the logic board in the middle, and I wasn’t about to mess with that. I’m concerned I may have candy or some dust into some clumps in there somewhere. There’s a function on TG pro to blast all the fans in an effort to blow out any sense adhere dust within the chassis. I haven’t tried that yet

Best, Seth

To all those that have assisted and given their help in this overheating and very high RPMs of the fans in my three iMac’s, I have found the solution, which might be helpful to others. Many had recommended a few apps to control the fans on their iMac. However, Macs fan control, and TG Pro, one or both were the culprit of my fans RPM going all over the place and getting very high temperature readings, and even shutting down my computers. I completely eliminated both of these apps and all their orphan files, which they were many, using Find Any File. Find Any File I have use for nearly a decade and is a central tool in finding orphan files that are left behind when you delete an app and you think all associated files are also being deleted as many show up asking if you want to remove all of them. Well, it does not. There were over a dozen orphan files that Macs fan control left behind by crystal idea, the same for TG Pro which I paid for. Deleting all of these files for both these apps, which were very persistence in repairing until I manage to eliminate all orphan files.

All three of my imac’s are now running 900 to 1200 RPM as they had been previously and all temperatures are in the 30°C - 40°C. The one app that I have used for nearly a decade is now showing everything back to normal, iStat Menus.

This causes me to wonder if I was getting spurious temperature readings from the sensors making me believe I had to control the fans so my computers would not be overheating. I would hate to think there are those that would really do something like this to make one believe their app was essential? How do you explain all of my three computers now are running the fans at 900–1200 RPM, where before they varied 2000 to 3500 RPM, and a minute later would be down to 1500 RPM, then 3300 RPM and getting temperature readings 70°C to 90°C at times. I had removed all settings for these apps to control the fans, so why were my fans going wild all over the place as well as the sensor readings for temperature? After complete removal of these two apps, specifically the orphan files found by Find Any File did these wild changes in fan velocity and high temperature readings disappear? Now with the same software in idle mode running, which are my screensavers showing images from my photos library and Time Machine. Everything is back to normal after deleting these two apps and all their orphan files. It wasn’t until I deleted the orphan files did things return to normal. Again thanks to all. Best, Seth