Dear seb,
You need to use the bootpack for your model and graphics. Use myhack from the usb installer to install the Extra folder. After that, you need to run myfix full mode on the os x partition before rebooting into it.
After you got your basic system running, download and install EDP 2.2 to configure your internet connection. After that, download and install EDP 3.1 to improve system stability and performnace.
Cheers!