Hello. I've been trying to boot from a clone copy of macOS High Sierra 10.13.6 made from my iMac on an external drive that has been formatted as APFS and the Mac Pro 5,1 I just got continues to boot into recovery mode instead of the OS. The Mac Pro is already on a clean install of HS 10.13.6 so I'm using the Startup Disk Manager to attempt to boot into the external image. Does anyone know WHY it will not boot into the cloned disk image and continues to boot into recovery mode and how I can get it to do so? All of my programs are on the cloned image, otherwise I would not bother. When in recovery mode and select startup disk as external image it boots right back into recovery mode. Also, getting a grey television static from time to time which can only be bypassed be performing a hard restart to the computer.