If this fails, make grep EE /var/log/Xorg.0.log, and put i here along with /etc/X11/xorg.conf file.
..but because xorg.conf usually has loads of comment lines (that we don't need here) and other things we aren't interested in now, either post the whole file without comment lines, or just post the relevant sections of it. To easily get the commented lines out, so that only the non-comment lines are showed, you can use grep. For example to save the xorg.conf contents without comment lines to a file called xorg.conf.nocomment under /home/username/, use
grep -v "^#" /etc/X11/xorg.conf > /home/username/xorg.conf.nocomment
grep usually picks only lines that match the given string, but with -v
it picks only lines that don't match the given string; the target string ^# means "any line where the first character is #". So lines that don't start with # are printed; > is then used to direct the output to some file. After this post the contents of the file created..the file is usually a lot shorter without comment lines.