I am having somewhat of the same problem. Here are my specs: Mobo- -Asus P9X79 PRO (UEFI BIOS) CPU- -Intel Core i7-3930K BX80619i73930K Unlocked Processor (LGA 2011) GPU- -ASUS GTX670-DC2-2GD5 GeForce GTX 670 2GB (PCI-e 3.0) RAM- -G.SKILL Ripjaws Z Series 32GB (4 x 8GB) 240-Pin DDR3 SDRAM DDR3 1866 (PC3 14900) I have tried using (PCIRootUID=0) and (GraphicsEnabler=No) in the Uni Beast Command line. But I can't get to the installation screen, just the grey apple logo and the white back ground. Also I tried (-v) to see if there was an error message, but I couldn't really find one. PS: Can I use 2 codes at one time in the Unibeast Command line? If so, how?