Problem upgrading Mid-2012 Mac Pro from High Sierra to Mojave
I have a Mid-2012 Mac Pro running High Sierra (10.13.6) and have purchased a Mojave install USB stick from Amazon. After booting from the USB stick, a macOS Utilities window comes up and I select “Install macOS” and click “Continue.” An “Install macOS” window appears which says, “Installing Mojave on this Mac requires that all graphics cards have Metal support and that FileVault is disabled.” System Report shows that my Nvidia GeForce GTX 980 Ti supports Metal and I have FileVault off (it was never enabled). The only option from that window is to Quit.
Any help would be greatly appreciated.