Black screen after logo seconds after launching game

[platelminto]

Basically I have already read the troubleshooting guide, and my problem was included but both the fixes (turning off SSAO & checked if my graphic card was updated) didn't work, the game still gives me a black screen seconds after it launches. I tried restarting Steam, changing a few of the settings, nothing. I read I should check that my DPI is at 100% but I do not know what that means or where to change it, since I couldn't find it in the game settings panel. My drivers have OpenGL, I have a Mac OS X 10.9.3 and I've downloaded the game an hour ago. Anyone got any ideas on a fix?

Thanks for reading,
platelminto.