Black Screen when starting the game.
 

AMD Phenom II X6 1055T
ATI 6850 HD, latest drivers.
8 Gig RAM
Windows 7 64-bit

KB:TL

When i start the game up I am greeted to a blank introductory screen .(presumably company logos and such) The games title screen pops up, so im thinking it was some weird fluke. But when I start a new game and finish the intro story the screen goes black again. the only thing I can see is the HUD, and the mouse cursor.

Does anyone know what i can do to remedy this.