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iMac Intel 27" Late 2009 Hello there, My iMac is having serious freezing issues. When I was watching a YouTube video, my iMac completely froze. I could only move the cursor. I had to shut it down using the power button. It froze a few more times before it started freezing when starting. It would freeze at the Apple logo and the progress bar. I tried resetting the NVRAM. Started in Safe Boot to close all the programs that hadn’t closed properly. Next I reinstalled macOS Sierra from recovery. That didn’t work. Then I took it to the apple Genius Bar where they did some heath checks and it passed all of them. Next they reinstalled a fresh copy of macOS directly from their servers. It started up fine. I set up an account whilst there and I brought it home. I tried customizing my Mac and it started freezing again. Before taking it to Genius Bar, I even swapped the rams to see if they corrupt. But they weren’t. I still had the same problem with the other rams. I don’t know what is wrong with this machine. 2.5 years ago I also had the logic board relaxed through Apple. I can start the Mac in Safe Boot only. Please help! Cheers! Abhishek
When you reinstalled Sierra from the recovery partition, I’m betting that you did NOT do a clean install but instead just replaced the in-place operating system. That would be why your installation failed but Apple’s succeeded. The key – obviously, I think – is the “customizing” you’re doing to your Mac. Something that you’re doing or installing is creating an OS-level problem. Clean-reinstall the OS and use it for a day or two like that. Don’t add any software or anything like that. If it’s still working, then add ONE thing and use it for a day or two. Repeat until your computer fails. The last thing you installed is the culprit.
