:) After installing Ubuntu 12.04 from a CD, everything goes perfectly until I restart the computer (after the installation process) im not able to see the login screen, I just get a black screen! so I press randomly keys and sometimes im able to see the background wallpaper but almost instantly the black screen appears. I think that I have to update the nVidia drivers or something like this I tried to start from the recovery mode, update my package, but still the same problem I can't start with the graphical interface as well, i get an error message 'no screen' !! I dont understand why I have this problem because before the installation im able to try ubuntu (from the cd) and works perfect. Thanks !!