Does your machine have only nvidia graphics or does it have, for example, both nvidia and intel graphics?
What are the exact details of your nvidia hardware from "lspci"?
If you wish to troubleshoot Xorg, probably the best thing to do is to remove everything from onboot.list, boot to a console prompt and then: $ tce-load -i Xorg-7.7 flwm wbar aterm
$ startx
If Xorg starts, check /var/log/Xorg.0.log for errors.
If Xorg doesn't start, enter "Xorg -nolisten tcp" at the console prompt and you should see some error messages.