iMac does not boot

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Level 1

18 points

iMac does not boot

Any help is appreciated to get my iMac up and running.

I have a fusion iMac from 2015. It has a 128 SSD and a 3 TB Hard drive. I am unable to boot it up because I get a circle with a line through it and it says support.apple.com/mac/startup. I went into Recovery mode and I can't reinstall MacOS because there is no disk drive available.

I looked at Disk Utility in the Recovery mode and see the following drives available:

Apple SSD SMO128 G 123 GB PC Internal Physical Disk
ST3000DM001 Media - 4.14 gb uninitialized

Disk Images:

Apple Disk Image (can partition) - 2.15 gb

OS X Base System (no erase, partition) - 2.01 GB

I tried to mount the ST3000M001 but it did not mount.

What should I do to reformat the drive so I can reinstall macOS Big Sur?

iMac Line (2012 and Later)

Posted on Oct 23, 2021 7:51 AM

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Answer 1

Best reply

Jack-19

Level 8

45,722 points

Oct 23, 2021 11:29 AM in response to Gentile

Gentile wrote:

Could I try to fix a split Fusion drive as described here by using terminal?

https://support.apple.com/en-us/HT207584

I would try those steps. However, it will erase all data, so I hope you have a backup.

Jack

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Answer 2

Gentile Author

Level 1

18 points

Oct 23, 2021 11:13 AM in response to rkaufmann87

Could I try to fix a split Fusion drive as described here by using terminal?

https://support.apple.com/en-us/HT207584

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Answer 3

rkaufmann87

Level 10

141,030 points

Oct 23, 2021 9:04 AM in response to Gentile

You have a Fusion drive iMac. You may have un-fused the drive or the HD portion may have failed. Either way, please take it to your local Apple Authorized Service Provider and have it serviced.

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Answer 4

rkaufmann87

Level 10

141,030 points

Oct 23, 2021 8:55 PM in response to Gentile

You can try it but your data will be lost.

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iMac does not boot

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