UNibeast installation, apple logo than white screen with cursor

[traumfabrik1]

Hi,

i made the ml usb disc as written in the unibeast guide but as in the title said, i never get to the installation window, it stops after the apple logo.

What can i do ?

Please help

 

[traumfabrik1]

IT seems i hace to delete some ATI6000controller.kext from my usb boot . but how ?