http://pastebin.com/f9e7eb26) or not specifying (http://pastebin.com/f55906554)) it happens the same: The machine cannot load X and it returns to a command prompt, but the problem is that the monitor flickers and even the keyboard does not respond well, so what I do is ctrl+alt+del (even the computer does not respond immediately to this command).
And from other partition I work. If I delete or rename the "xorg.conf" file, that partition (the one with Ubunut9.10b+fglrx8.661) loads perfectly well, but of course with no 3D acceleration.
What other information/output files can I bring to you.
(Meanwhile, I sent another petition for ASUS to make a new BIOS update for this machine... At least I will continue doing that until they respond)