Xorg can't find screens

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http://askubuntu.com – I recently installed Ubuntu 12.10 on my laptop. It installed successfully, but whenever I boot into it, after the GRUB screen I get a text TTY. I can log in with that and enter command-line commands. I have tried: running startx. After initializing extensions, it tries to load extension GLX and then has a fatal error, "no screens found". Looking at /var/log/Xorg.0.log shows that "Screen(s) found, but none has a usable configuration." running sudo Xorg, which did the same as startx. removing and reinstalling xserver-xorg with apt-get. This ran successfully but didn't seem to change anything. (HowTos)