[ubuntu_studio] Macbook Air 3.2 black screen after reeboot

Hi, today I installed a fresh ubuntu studio 12.10 out of the live system. After reebot I have a black screen and nothing happens - I can hear that the mac is running but no screen.

I am a complete noob (no linux experience) therefore any solution which I hope you have should be very detailed!!!

The point is, starting the live system works well, screen started, I tried some things, everything was all right.

Mac: Macbook Air 2010 - NVIDIA (320m)

Thanks!