Hi, Jay.

Originally Posted By: JayO
Hey Mark,
Well I quickly threw the stock 5770 back in my machine just now and confirmed that BIAB does in fact launch, although I really didn't test it much.
Possibly if you have the stock card you could try it temporarily, just for troubleshooting purposes to see if BIAB launches.


Not sure where the stock card is anymore, but I'll go searching (thought I was over this kind of thing. Oh well.)

I deliberately avoided the NVIDIA cards for just that reason, though the RX580 is a generic rather than Mac-boot card: a lot cheaper that way though it might cause this issue. I've got no idea of what the PG Music guys are doing spawning a shell to run up ioreg but I guess it si happening for a reason. Just wish someone who knows would fill in the dots... :-/

Thanks again


.. mark.
(BiaB 2020 Mac; macOS 10.14.6; MacPro 5,1 56Gb 2xHex-Xeon RX580)