Mac problem loading game - black screen after logos (PLEASE HELP)

[Niall]

Everytime i load the game on steam the frictional logo comes up and then i get a black screen where the menu screen should be and i can hear the music. I'm then forced to force quit the game.

Here is the mac i'm using,





it's got an NVIDIA graphics card, I'm not sure why it's saying Intel HD under the graphics section

If anyone can help me out, i'd really appreciate it. I've just bought this from the steam marketplace and i feel like i've wasted my money