I buy this game on steam with 80% discount,and while i downloaded it,it seemed that the game will work normally.But on start the screen turns black (as when I turn off monitor)
I try to find something how to fix it.I reinstalled Directx what is in the game files.I turn off all programs and it not work

AMD Phenom II X4 965 on 4.00 Ghz (overclocked)
GTX 550 Ti (not overclocked)
12GB RAM Corsair Vengeance

Thanks for help a lot