GUI for CentOS 6.2 minimal install Edition

yum groupinstall "Desktop" "Desktop Platform" "X Window System" "Fonts"

yum groupinstall basic-desktop desktop-platform x11 fonts 

Once the minimal installation is done & then you are installing the 
Deskstop Packages changing Default runlevel from 3 to 5 does not start 
Xorg for GUI hence we need to add “exec /etc/X11/prefdm -nodaemon” in 
/etc/inittab file.