when i start backtrack, it boots normal, then i log in.

when i type startx now i get a error message telling me
Code:
(==)Log file: "/var/log/Xorg.0.log" Time: Fri Dec 14 14:11:22 2007
(==)using config file : "/etc/X11/xorg.conf
(II) Module already built in
(EE)VESA(0): No matching modes
(EE)Screen(s) found, but none have a usable configuration.

Fatal server error:
no screens found
giving up.
xinit: Connection reset by peer (errno 104): unable to connect to X server
xinit: No such process (errno 3): Server Error
I get the same message when i type xconf and then startx =(
I am using a HP Compaq 6715s notebook (screen resolution: 1280x800)
I have the problem with Backtrack2 and with Backtrack 3, too.

Can anyone help?

greets elemmakil