Anyone else getting the "Prohib" sign after the full installer loads? I seem to only get it on a Sierra attempt, while on a High Sierra attempt, I end up with multiple EFI boot options (As though they're multiplying) or the dreaded black screen. Or the dreaded "Insert a startup disk and press any key" while I'm holding down F12. I'm borking something up for sure. My build should be showing here. I can't give you a screen capture, unfortunately. I've wiped so many times (that something-something is looking like a something something...) Anyway, a good build with Windows 10, BIOS is squared away. It's just not happening for me past the initial OS install.