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A2115 / 2019 / Processors from 3.0 GHz 6-core i5, up to 3.6 GHz 8-core i9. Released March 19, 2019.

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iMac 27" Boot loop (Everything tried)

Hi everyone

Yesterday i went to a friend who have a iMac 27" 2019 running Monterey and Fusion Drive.

He called me because the iMac had began to restart it selv in loops doing the night. I told him to do all kind of things but it didn't help so i went over there and did it all my selv and still didn't work. Then i reset the fusion drive and rsinstalled the OS and it was running good for 2 hours and then i went home.

Today he called me. Same problem again. I have done hardware Diagnostic, Safe Mode etc. etc. etc. I done it all.

Now i suspect memory maybe or PSU because it is really weird.

Any suggestions ? is it possible to test ram by trying one blok at the time ?


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I would start by plugging the keyboard into the iMac with its charging cable. This way we can ensure that the commands we are giving the computer are actually getting there. Then, I would try an SMC reset. Without verifying if this helped, go ahead and try a NVRAM reset. This should take care of most issues that could occur with your RAM. After you’ve done both resets, power the machine on and test functionality.

If the issue persists:

Review your system report (Apple Menu > System Settings > General > About > System Report). When the report is generated, go to the left side of the window. Under Hardware, “Memory” is listed towards the bottom clicking here will show you which RAM slots are in use. Depending on how much RAM you have installed, this should show 2 - 4 slots of RAM in use. Ensure the system has properly identified the RAM, how many gigabytes are on each chip, and if the state is listed as ok. If it’s not, it’s a good idea to boot the system with only one RAM chip in one at a time.

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