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When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.
Disk repair, as per the Apple support web page, seemed to function properly for all volumes in the Fusion drive, but computer still won’t open - gets stuck at half way on the progress bar
iMac 27″, macOS 12.2
Try to boot in the safe mode to see if the mac Will boot completely that way
Start up your Intel-based Mac in safe mode
Try to boot in the safe mode to see if the mac Will boot completely that way
Start up your Intel-based Mac in safe mode
My first guess since it eventually booted is a failing hard drive.
You can try booting the Apple Diagnostics. If the online diagnostics take a long time to boot, then it is unlikely using an external USB3 SSD will be an option. Unfortunately the diagnostics don't detect most drive failures.
You can try running DriveDx to check the health of the hard drive assuming the system can complete the download. If there is any "Warning" or "Failing" notices for the hard drive, then the drive is worn out or failing respectively. This does not necessarily apply to the SSD. If there are no warnings or errors, then post the complete DriveDx text report here for both the hard drive & SSD so we can review them.
If the hard drive is not worn out or failing, then try booting into Safe Mode in case some third party software is really having problems.
Thanks for the tip.
However, I didn't get around to using it since my Mac finally opened up about 2 hours after the progress bar had initially stopped.
I'm now busy transferring files from my Time Machine backup to a new computer....
Disk repair seemed to function properly, but imac 27” 2015 still gets stuck half way through progress bar when trying to open computer
