GDM, the Gnome Display Manager, is one of the display managers for the Linux operating system. It is the default display manager for the CentOS Linux distribution. The GDM is not restarted like a typical service. Instead, it has its own restart command. When you restart GDM, it automatically logs out any users who are logged in using the display manager.
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Click on the terminal icon on the desktop panel to open a terminal window and access the command line. If the Gnome desktop is not working, you will already be working at the command line.
Type the command "su -" to become the root user. Type the root password when prompted.
Type the command "/usr/sbin/gdm-restart" to restart the Gnome display manager.
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