When booting, you should have an option (something like "interactive mode") that lets you decide whether or not to start any of the services. You may also have some other boot options, but that depends on your system.
For instance, booting to "single user mode" or "without network" may be ok too.
When starting the game server service, your system actually runs a script in /etc/init.d/ (probably with the
It seems to me that this script just hangs. Perhaps it is waiting for user input or trying to connect to the game server over the internet. In any case, the script doesn't work properly.
You could try "Ctrl-c" or "Ctrl-d" while the system is hanging on the script, but I'm not sure it'll work.