Can't get a gui

[seanp@btinternet.com]

I just installed potato and when I get to the (text) login 
propmpt, I can login, but I can't get gnome or any sort 
of graphical login etc. 
I changed 
:id:3:initdefault:
in /etc/inittab to 
:id:5:initdefault:
as I thought that run-level 5 would initialise the x-
window system, but no joy. I dropped down to level 1, 
back up to level 5 and still no change. I rebooted, and 
still just a text login. Any help would be much 
appreciated as I've had to go back into windows for the 
first time in ages to send this email :)