I am using CentOS-5.5 its not stasting. while booting its showing "GDM could not write a new authorization entry to disk.Possible out of diskspace.Error: No space left on device" if press then showing one more message "Could not start X server (your graphical environment) due to some internal error. please contact your system administrator or check your syslog to diagnose. In meantime this display will be disabled.Please restart GDM when the problem is corrected. and if check filesystem uses by "df -h" its showing

Filesystem             Size  used Avail Use% Mounted on
                       285GB 285GB 0   100%    /
/dev/sda1               99M   12M 82M  13%     /boot
tmfs                   997M   0    997M  0%    /dev/shm
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    As a point of fact, the FAQ clearly states that this site is for professional systems administrators. Given that you don't know how to delete files it's a pretty good guess that you are not a professional administrator. Jan 30, 2013 at 5:42

2 Answers 2


It's true. You ran out of disk space. Delete some unnecessary files and then try again.


You can delete files with the command

rm /path/to/file

You can delete folder with the parameter -r

rm -r /path/to/folder

Might be your home folder that is using a lot of space.


du -sh /*

You can see what folder is using the most space.


ls -lh /path

You can see the file sizes.

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