I cant get it to play

I have 2011 basic macbook pro model. I purchased COD4 MW for Mac and I had some serious lag. However I heard this game would run better but now I cant even get in to play. I get the square loading box but when it changes to the real screen its just bluish black and it doesnt work. It takes about 4 minuets to even get to that screen. Anyone know why? Is my computer that bad that it cant even play this game?

binsplace about Call of Duty® 2