Inject Nvidia didn't help, but nv_disable=1 got me to the installer. However the same installation error message that I've been getting for a few weeks now appeared. "macOS could not be installed on your computer" an error occurred, blah, blah, blah...RESTART.
There are several other OS's on this computer that are operating flawlessly. CPU, motherboard, and memory are all brand new. I'm lost.