Iv only had bt3 for about 3 weeks and this is my first post on this forum so if im a little wrong someone will have to correct me.
I think i had that problem too after i installed my bt.
If I remember right, when you get to the login area, above the username command prompt it says... use root then toor for password. on this screen it tells you to type "startx" right?
I think there is a command there like configure. im sure i had to configure first coz i kept getting a black screen.
If this dont help sorry, but im sure i did that.