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Question: iMac 27" Late 2009 freeze and boot stuck at 50%


from some days my iMac sometimes freeze (only mouse can move) and, after an hard shut down, boot stuck at 50%.

iMac version: 27" late 2009

macOS High Sierra 10.13.1

It random freeze (also when I'm only using Firefox) and I can re-boot normally only after some PRAM resets or after entering in safe mode. After that I can use it normally whitout any visible problems, but randomly after some it happens again.

Any advices?



iMac, macOS High Sierra (10.13.1), 27" Late 2009

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Nov 14, 2017 4:10 PM in response to francy88 In response to francy88

Try booting into the Recovery Partition by holding down Command + R when you hear the startup tone. If it starts open Disk Utility and then run First Aid on the HD 2-3 times back to back. If any errors occur then take the computer into your local AASP to have the HD replaced.

Post back with your results please.

Nov 14, 2017 4:10 PM

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Nov 15, 2017 12:54 AM in response to rkaufmann87 In response to rkaufmann87

Hi, I tried to do as suggested, but from recovery mode the First Aid response something like that (translated from italian):

"Unable to repair the volume because other APFS volumes are enabled in its container. Deactivate them or make the repair while another macOS system is in execution".

After that I boot in safe mode and I run First Aid from here 3 times without errors. Rebooted and not able to boot normally again 😟

Nov 15, 2017 12:54 AM

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Question: iMac 27" Late 2009 freeze and boot stuck at 50%