If you want to start it up automatically, then instructions are [http://www.idevelopment.info/data/Unix/Linux/LINUX_AddGNOMEToCentOSMinimalInstall.shtml here]
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else just type:
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startx
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After copmmand line logging in.
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You also ought to create a user to run under - you can use the graphical admin user prgram from the above, and then login as that.