Formatted now can't install OS

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Level 1

8 points

Formatted now can't install OS

Hi

I've recently formatted my imac (late 2015) to be reset to factory setting.

After formatting and trying to reinstall the OS (Sierra) it's saying that the disk has errors which I can't repair when I try to run the disk utility.

I've tried to reinstall the OS but it only goes half way then exits, I'm kinda in an endless loop of jot being able to start the mac back up properly.

Any suggestions on how I can proceed. I have another mac same year which is working so I can download anything I need to aid the currently not working one.

TIA

iMac Line (2012 and Later)

Posted on Mar 22, 2021 7:36 AM

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Answer 1

Recall8 Author

Level 1

8 points

Mar 23, 2021 10:40 AM in response to rkaufmann87

Tried running the first aid. Just states there's an error. So does that mean the HD is useless now and needs replacing?

It only occurred after installing the Big Sur update, which seems to have bricked the imac. 😔

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Answer 2

rkaufmann87

Level 10

143,688 points

Mar 23, 2021 11:05 AM in response to Recall8

Big Sur did not brick your Mac. Whenever any OS is installed on a computer it makes the storage device do a lot of work by reading, writing and removing stuff. This stresses a drive, if the drive is in good shape it's no problem. If the drive is not in good shape this can push it over the edge.

It's kind of like, if you run a marathon you should be in good shape. If you are 50lbs overweight and have a heart attack while running the marathon it's not the marathon's fault, you just aren't in shape to run it.

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