Hello. I have a similar problem with the black screen, but restart before the login screen.
I try too much things but nothing works
(Config: mb MS-7788, gtx 970, i5 3330, sierra 10.13.4)
I try Nvidiagraphicsfixup.kext and lilu as I see on tonycraps, still not working
>Cuda installed, Nvidia installed, Nvidiadriver checked on clover, key Nvidia add ok, nvda_rv=1 uncheck, Nvidia inject uncheck