iMac won't boot after using migration assistant to new mac studio

Question

iMac won't boot after using migration assistant to new mac studio

I got a new mac studio so I used migration assistant to move everything from my older (I think it's a 2015) iMac onto the new computer. migration worked well but now I can't get my iMac to boot up. It will show the apple logo then when the bar is about half loaded it shuts down. It won't boot in safe mode. I have gotten to the disk utility and it keeps saying it can't repair the Mac HD drive and it can't erase it either. It also shows that the HD drive is not mounted. What do I try now?

iMac 27″, macOS 10.13

Posted on May 12, 2023 3:35 PM

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Answer 1

Top-ranking reply

rkaufmann87

Level 10

144,652 points

May 13, 2023 11:20 AM in response to Riversarelife

Did you restart as I instructed you to? Also, did you follow the instructions in Setup Assistant and Migration Assistant or did you try some other method????? It is critical that you answer all questions if you want help here.

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Answer 2

BDAqua

Level 10

245,567 points

May 12, 2023 6:36 PM in response to Riversarelife

Start with this of M1 or M2 Mac...

On your Mac, choose Apple menu > Shut Down.

Wait for your Mac to shut down completely. A Mac is completely shut down when the screen is black and any lights (including in the Touch Bar) are off.

Press and hold the power button on your Mac until “Loading startup options” appears.

Select a volume.

Press and hold the Shift key, then click Continue in Safe Mode.

The computer restarts automatically. When the login window appears, you should see “Safe Boot” in the menu bar.

Restart normally.

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Answer 3

rkaufmann87

Level 10

144,652 points

May 13, 2023 4:22 PM in response to Riversarelife

Okay, I would start all over again. Please start the new Mac in the Recovery Partition ( Use macOS Recovery on a Mac with Apple silicon - Apple Support )and erase the SSD and then install Mac OS from the Recovery Partition. Then closely follow the steps in Setup Assistant and Migration Assistant. If you cannot start in the Recovery Partition, please give AppleCare a phone call for assistance.

AppleCare Contact Info

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Answer 4

May 13, 2023 11:43 AM in response to rkaufmann87

I held the power button for 15+ seconds and it started to boot up and stopped halfway like before and powered down again. I kept holding it and nothing.

I used migration assistance for the migration to the new computer and once it finished and I shut down the iMac it won’t boot up.

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Answer 5

rkaufmann87

Level 10

144,652 points

May 13, 2023 11:54 AM in response to Riversarelife

Okay, did you have any third party antivirus, cleaning, optimizing, security, VPN or any other third party "maintenance" type apps installed on the old Mac? If so that is your problem!!!!!!!!!!!!!!!!!!!!!!

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