thanks for answer here is the /etc/gdm I am using for the moment CentOs 5.2 , gdm is it different for Centos than for debian ??ls -l /etc/gdm/ total 76 -rw-r--r-- 1 root root 2822 fév 4 2009 custom.conf drwxr-xr-x 2 root root 4096 nov 23 2008 Init -rw-r--r-- 1 root root 4048 mai 28 2008 locale.alias drwxr-xr-x 2 root root 4096 nov 23 2008 modules drwxr-xr-x 2 root root 4096 nov 3 13:23 PostLogin drwxr-xr-x 2 root root 4096 nov 23 2008 PostSession drwxr-xr-x 2 root root 4096 nov 3 13:23 PreSession -rw-r--r-- 1 root root 73 mai 28 2008 securitytokens.conf -rwxr-xr-x 1 root root 5536 mai 28 2008 XKeepsCrashing lrwxrwxrwx 1 root root 21 nov 23 2008 Xsession -> ../X11/xinit/Xsession
thanks for help