then a few things
most ( read almost all ) OS's do not let root start the gui
-- bt is a bit different -- it ASSUMES you ARE a hacker --
so you DID fallow
http://www.backtrack-linux.org/tutor...drive-install/
have you read the backtrack webpage ?
http://www.backtrack-linux.org/tutorials/
or the wiki
http://www.backtrack-linux.org/wiki/index.php/Main_Page
but i would NOT recommend this distro for a "new to Linux" user
do a LOT of reading and studying on the backtrack website
is this really what you WANT to do
http://www.offensive-security.com/on...rity-training/
penetration testing and system cracking
also your hardware specs would help
for instance if this is a OLD computer from 2000 then a gui might never work if you have only 256meg of ram .
--------- most distros ------------
fedora,ubuntu,suse,... the root gui HAS BEEN DISABLED .
so there will be a error if you try to login to the gui as root .
also most os's do not use "sartx" anymore
GDM for Gnome
KDM for KDE4
XDM for others
what desktop did you install ? gnmoe ,kde,xfce,... ?