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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