I broke my DVD drive on my macbook pro so I just bought an external DVD drive. I am trying to play sims so I put it into my external DVD drive and installed the game and went to go play it but it is saying that the game disk is not found and to please insert the disk before proceeding. The external DVD drive lets me play movies and cd's and let me install the game with no issues but when I want to play the game it says the disk isn' inserted. How can I fix this??