My iMac is shutting down during video rendering (Davinci Resolve and Adobe Premiere). Sometimes it will shut down during editing, but recently only during render.
I have disconnected all peripherals and tried rendering files from desktop to desktop but it still shut's down and reboots.
PLEAE HELP!!!!
iMac Line (2012 and Later)
You Mac has automated thermal protection to prevent component damage if the temperature gets too high, so unexpected shutdowns are most commonly caused by overheating.
Overheating is most commonly caused by dirty/obstructed air intake and exhaust vents, or unneeded third-party software.
First make sure the intake vents on the bottom of the case edge are clean and nothing--yes, nothing--is stacked under the computer. It is surprising how much the temps change if the distance between case bottom and desk is reduced by half. The exhaust vent on on the back under the top of the stand. Make certain the computer is not pushed against a vertical surface behind. Keep a minimum of six inches (150mm) between the computer and anything behind.
Your Etrecheck report lost its formatting making it hard to read, but there is one glaring issue: CleanMyMac. It is totally unneeded and is competing with yur Mac's built-in protection and maintenance routines. It can contribute to overheating.
You Mac has automated thermal protection to prevent component damage if the temperature gets too high, so unexpected shutdowns are most commonly caused by overheating.
Overheating is most commonly caused by dirty/obstructed air intake and exhaust vents, or unneeded third-party software.
First make sure the intake vents on the bottom of the case edge are clean and nothing--yes, nothing--is stacked under the computer. It is surprising how much the temps change if the distance between case bottom and desk is reduced by half. The exhaust vent on on the back under the top of the stand. Make certain the computer is not pushed against a vertical surface behind. Keep a minimum of six inches (150mm) between the computer and anything behind.
Your Etrecheck report lost its formatting making it hard to read, but there is one glaring issue: CleanMyMac. It is totally unneeded and is competing with yur Mac's built-in protection and maintenance routines. It can contribute to overheating.
Uninstall Clean My Mac X according to there developer's instructions. Do the same for PACE. Both are totally unnecessary and will do more harm than good. You can do a Google search for the uninstall directions.
We may have a big "AH-HAH!" moment here. I would have never suspected the placement of the vent was problematic because my chair is higher than the center of the screen.
I just bought our first "thin-case" iMac and was surprised the exhaust port was so small and hidden compared to the long and hard-to block slot. However it never occured to me that the computer's own stand could block it until I read your follow-up information. I just tipped mine down as a test and the stand is under an inch from the exhaust in that position. Not enough
You have made an important discovery. Let Apple know:
Thank you Allen. The forum is no allowing me to post the etrecheck info directly, as it is over 5000 characters.
I only installed the CleanMyMac after a month of shutdown/reboots. Since the install the issue has only occurred when I am working on video. Prior to using CMM it would shut down when working in Logic Pro or Safari (Youtube).
I believe the vents for this model (thin frame) are located on the bottom of the unit. It is unobstructed and I wiped it down with a cloth.
Done. I’ll try this a few more days and then update
UPDATE
I took the iMac to a nearby UbreakIfix stop and they also ran a diagnostic that looked clean. No software for hardware issue that he could find. So I tried to complete the task that was causing the issue BUT i felt the fan behind the machine was putting out some really hot air so I tilted the iMac away from the base (which I never do because my desk is higher than my chair)
...and viola! was able to complete the task.
Although it's not conclusive I wonder if the iMac was not designed to tilt down, but rather tilt up away from the base.
I'll test it a bit more. Any thoughts on this?
iMac (Retina 5K, 27-inch, Late 2015) unexpectedly shutting down/rebooting
