I've installed a new SSD on my Mac Mini 2014. So I have a new SSD connected via PCIe and the old OEM HDD via SATA.
I've installed a fresh copy of High Sierra on the new SSD and seems to work well. But after using Migration Assistant (to copy data from HDD OS X installation to the new SSD) the system begins rebooting loop on Apple logo screen.
I've reinstalled it a few times, but the same thing happens after Migration Assistant. Any help?