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I am only able to boot through my USB (Hit F11 on startup -> select UEFI:USB... -> On Clover, choose to boot from SSD) When I try to boot through my SSD (Let the computer run it's course on startup, automatically selects SSD) I get a prohibited sign. I've attached a photo of the -v results from...

There's a video of what is happening. I have the newest Nvidia drivers, but in the bar at the top of the screen it shows "OS X Default Graphics Drivers" as enabled and not the Nvidia drivers. Using 'kextstat' in terminal shows them (I believe) as enabled, so I don't think that's the problem...

I've just finished building my Hackintosh and am trying to get it set up. It boots into Sierra OK, at times I get the prohibited message (any help here would be appreciated) but the bigger issue is that the entire screen flashes black, and then turns back on, and flashes black, and back on etc...