>
>See if you can access it using ssh from another PC.  Then check 
>/var/log/Xorg.0.log for any error messages.
>-- 
>
I have checked my Xorg.0.log, there is no error message. I have a question,I read xorg.conf , I didn't find any area about Window Manage, so how xorg-server knowswhich WM to invoke when I use "X -config /etc/X11/xorg.conf" ?BTW, among my class I am the only one who uses Linux, so it's impossible to use ssh.