I have a problem where I am getting green lines and distortion lines on my screen when I am playing COD 4. I've been reading through forums on what is happening to other people with the same problems. I have read that some have tried a SMC reset and have had good results temporarily. I think there is a way to replicate the problem by going to apple's movie trailer site and downloading three HD trailers. Put all the trailers on loop and let run for at least 10 minutes. Please post your results.. Note: If you did do a SMC reset put the machine to sleep and then wake it up and see if the graphics problem is still gone. Thanks.