If you would prefer that it not start when the machine boots -- perhaps because you never use it and want to save the resources -- you'll need to edit the /etc/inittab file and change the default runlevel:
1. Log in to your server through SSH (instructions for this are on the "Server control" page of its control panel).
2. Type this command and hit enter:
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nano /etc/inittab
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id:5:initdefault:
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id:3:initdefault:
The next time you reboot your machine (such as through the "reboot" command), you will see a normal login prompt in VNC instead of the Gnome GUI.