New SSD, Mac Mini Disk Utility will not load old HD or External Drive
I just replaced the original Toshiba HD in my Mid 2010 Mac Mini with a 1TB Crucial SSD.
I formatted and clean installed OS X El Capitan 10.11.3 from a boot installer drive. My firewall is open.
I am trying to use the Migration Assistant to move files from the old Toshiba HD (connected with a USB universal drive adaptor) or my external time capsule backup drive (connected with via USB) and neither are being loaded by the Disk Utility. I get an endless spiral graphic and "Loading Disks." with no result after a reasonable time waiting.
I connected a different external HD (A Seagate 1TB SSD) via USB and it was recognized.
Any help with getting these drives to connect would be most appreciated.
Mac mini, OS X El Capitan (10.11.3)