Before i get a torrent of abuse i have looked at the fourm and nothing in it seems to relate to what i have people have the same issues but i cant seem to fix my problem with there solutions any how

when i boot up my BT3 Final live cd i get to the selection screen fine but if i chose any option it will just black screen untill i press the power button then it produces the boot screen but nothing is happening

i can boot in to BT3 Final buy going to text mode and entering in
then starting startx at the bt prompt
what i need to no is why this is happening and how do i fix the problem thanks