Good evening, I had a hackintosh with the X Sierra tried to upgrade to Hight Sierra and got stuck on the black screen. I reinstalled by Tony's guide here and tried all the possibilities of this topic, but I could not. Some installation possibilities on this hardware: Asrock Extreme 4, I7 3770k, gtx 690, 16GB ram corsair, ssdhd kingston240gb. Help! It's been 7 days since I've tried the whole day and nothing .. Obs. Without the video card the system works with a perfection. Replacing the card does nothing else.