Disabling startx in gdm

["Kapil Khosla" <khoslakapil@lycos.com>]

Hi,
I am trying to disable X to start up at boot time and want to type "startx" to enter into KDE which is my default enviornment.
I use gdm and want to know 
1) Which file actually is responsible for starting up gdm 
2) How can I disable  gdm to startup
3) I am not able to login as root from gdm...how can I login as root from gdm ?
Thanks
Kapil



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