i have centos 5.3 i got the login screen but after logging shows error as--
your session only last less than 10 seconds . if you have not logged out yourself tyhis could mean that there is some installation problem or that you may out of disk space .try logging with one of fail session to see if you fix this problem.
views details (~/xsession-error file)
/etc/gdm/presession/Default:registering yoour session with utmp
/etc/gdm/presession/Default:running :/usr/sbin/sessreg -a -u /var/run/utmp/ -x * /var/gdm/0:xserver" -h " "-l ":0: "username"
localuser:username been added to access control list
/etc/X11/xinit/xinitrc.d/sabayon-xinitrc.sh:line11 3930 illegal instruction /usr/sbin/sabayon-apply.
there is lot of space in hardisk and tmp pls suggest what to do