Do not fear the command line. You need to use it here.
Log on as root.
Open a terminal window.
Change working directory to /etc/X11.
Find the backup copy of xorg.conf.
Copy that back to the active version of xorg.conf.
Here are the commands. First log on as root.
ls -l xorg.conf*
cp xorg.conf.saxsave xorg.conf
Here I have used my SuSE partition for an example.
root> ls -l xorg.conf*
-rw-r--r-- 1 root root 5524 Jan 5 22:19 xorg.conf
-rw-r--r-- 1 root root 5398 Jan 5 14:09 xorg.conf.install
-rw-r--r-- 1 root root 36 Jan 5 14:28 xorg.conf.md5
-rw-r--r-- 1 root root 5520 Jan 5 22:19 xorg.conf.nvidia-post
-rw-r--r-- 1 root root 5398 Jan 5 14:28 xorg.conf.saxsave
These are all of the files named xorg.conf* in my SuSE v10.2 system /etc/X11 directory. Notice the one named xorg.conf.saxsave. You should have one of these.
This is a copy of the original xorg.conf file before you ran sax2. This is the file that you want to copy back to xorg.conf to replace the version that is not working.