error startx as user

[abac]

hi,
i can startx as root but when try to startx as user,this is the error:
server error:
Cannot move old log file ("/var/log/Xorg.0.log" to "/var/log/Xorg.0.log.old"


Please consult the The X.Org Foundation support
         at http://wiki.X.Org
 for help.

giving up.
xinit:  Connection refused (errno 111):  unable to connect to X server
xinit:  No such process (errno 3):  Server error.
this is the xorg permissons:
drwxr-xr-x    8 root user   4096 Aug 12  2004 X11R6
plz help me.