Question: When I start the game I can hear sounds but nothing appears on screen, it appears the game is running as it is showing in my dock.
Answer: It sounds like the game may be running at an unsupported resolution. If you press up/down and enter can the menu sounds be heard?
If so, close and start up the game again. Although you can't see anything on screen wait until all intros have finished and you can no longer hear anything. This should mean you are at the main menu. Without moving the mouse press:
Enter, Down, Down, Enter, Up, Up, Up, Right, Right, Right, Right, Right, Right, and then Enter again.
If done correctly this should hopefully change the resolution to something that is supported. If not, try increasing or decreasing the number of times you press "Right" at the end to toggle through various resolutions.