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A2116 / 2019 / 3,6 GHz Quad-Core i3, 3,0 GHz 6-Core i5 oder 3,2 GHz 6-Core i7 Prozessor. Veröffentlicht am 19. März 2019.

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Powering off during startup questions.

I have a 2019 4K iMac i3 8GB 1TB HHD and I installed 2-16 GB DDR4-2666 SODIMM and a 1TB MX500 SSD both are Crucial brand. I copied the HHD using Super Duper. Now when I turn the iMac on it starts showing the Apple logo and loading bar then about half way through it shuts itself down. Any suggestions? I also have the old HHD set up as an external…

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If you can boot up on an external bootable drive. Restart the system with the external connected and press the Option (⌥) key to enter into the Startup Manager to select the external drive. Did that work?

Reference: Mac startup key combinations

If it did then the SSD drive is messed up which would not surprise me! Super Duper can’t setup the APFS structures properly. You’ll need to reformat the drive fully, re-install the OS either via a local OS installer or Internet recovery. Then lastly, use Migration assistant to move your old drives user accounts, apps and data to the new drive.

I haven’t used any cloning app for a good 10 years now due to the fact cloning doesn’t deal with file errors or drive structures like you encountered here. Even when it appears to work you can encounter app and data issues where the file is missing parts corrupted where a copy with CRC would either find the missing piece or alert you the file was too badly damaged, cloning apps won’t do that!

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Awesome. Thank you. That’s exactly what I did and it worked great!


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Jaron Hathaway wird auf ewig dankbar sein.
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