progressbar

System Configuration: Model - Dell Optiplex 990. Processor - i5 RAM - 4GB Graphics - Internal. ( I have a GeForce 210, but didn't install that in the machine yet ) I tried this official guide...

I'm stuck at the black screen with the progressbar (that has no progress) with the apple logo. I'm using a HP envy 17 with a nVidia GeForce 950m and an integrated Intel Graphic 4400. I have installed the bootable USB in legacy mode with Unibeast. I have tried to add some arguments such...