Hello, 
  
I've created a Yosemite installation USB using Uni-Beast (f*ck sensored words). I'm booting the installation using the following flags: 
USBBusFix=Yes GraphicsEnabler=No -v -f 
  
It boots, but before the GUI should start, I'm getting a black screen. The USB stops loading screen, I've been waiting for about 10 minutes. 
  
Unfortunately I can't show you any errors because the black screen is just "showing" too fast. 
  
Could anyone help me with this? 
  
Thank you!