DirectX 11 not working

[blackrat]

I cannot play in DirectX 11, when starting the game, I only get a black screen, it hangs there.
In DirectX 9 playing seems fine.

My System:
Win7 64bit
ATI 5850, triple monitor Matrox TH2G
also Nvidia GTS 250 for two other monitors
Urgin Heaven benchmark and F1 2010 (DirectX 11) plays fine
Creative X-Fi
updated graphic drivers

If the minidump helps, I can post it?

[jaycw2309]

So you have an AMD card AND an nVidia card in your pc, am going to hazard a guess its confusing things a little.. The nVidia GTS250 isnt DX11 compliant, so that may be blocking the DirectX11? within the setup program are you able to select the AMD card to be primary display?

[blackrat]

Yes, in the setup program I can choose the correct monitor, and only this monitor (via TH2G box) is connected to the Radeon.

Lowering resolution and changing graphics settings didn't help.

[jaycw2309]

So you can choose the AMD for adapter, and the monitor the AMD is powering under monitor okay?