SC2 doesn't start (steam) -> HD5870 problem?

Yesterday i build a ATI HD5870 into my rig, installed newest drivers and SC2 wouldn't start anymore.



The process loads for a couple of seconds but then unloads completly.



I even tried to delete SC2 and reinstall it a couple of time with no luck.



I installed the newest Directx drivers just to go sure that nothing is missing.



The problem has to be related to the card somehow. Oddly i can run any other steam game with no problems. I even tested other games and they work without problems.



Somehow SC2 is the only game that doesn't want to start. My luck..it's the only game i want to play atm.



other than this i have Windows 7 64 bit and a Core 2 Quad 2.83 but i doubt it's of importance.



Could anyone help me with this?|||You need to delete your Game.prefs file.|||Thx i'll try this out. Hope that's the culprit|||Just wanted to say that it worked. Thx alot. Can be closed now |||this has JUST started happening to me as well....where is the game prefs in SupCom2 ??|||slinki|||Thanks