Trying to get a High Sierra clean install going and I'm at my wits end. 5,1 with a MVC-flashed Titan X. Created a bootable USB installer (10.13.4) Went into single user mode to apply nv_disable=1 Booted from installer USB Formatted SSD as APFS Installed High Sierra Installed the latest Security Update Made sure SIP was enabled Installed nVidia web driver Upon next boot, I got the circle with a cross through it. OK... Reinstalled High Sierra, Security Update, Nvidia web driver all over again. Rebooted This time it got further but the progress bar was taking forever (waited for 30 minutes before giving up) Tried adding nv_drv=1 boot arg. Made no difference, eternal load time.