@CaseySJ
Fixed the boot issue. Thanks for that.
Another issue...with Thunderbolt. I purchased a Sabrent Thunderbolt 3 to NVME dual enclosure. I placed my old Samsung boot disc in this and another Samsung NVME that I had in a USB3.1 enclosure which was plugged into one of the Thunderbolt ports and worked fine.
So...Sabrent plugged in to Thunderbolt port where USB 3.1 enclosure had been.LogitechStreamCam(USB 3.1) plugged into other TB port.
The old boot disk in the Sabrent shows and, in fact, booted. The camera works. However the second drive in the Sabrent doesn't show. In Hackintool the second XHC3 port shows unknown.
I have not used a Thunderbolt device before on this computer so I'm stumped.