Hello guys! I just bought a macbook pro 15'' for my studies. It is brand new, literally 3 days since I opened it. Everything was fine until I downloaded some games from the app store. Ι opened the first, Deer Humter, and I played for 10 - 15 minutes and suddenly it lags, everything in the screen is getting mixed up, almost like these old TV s when they didn't have signal, I don't remember how it's called in English and after 30 sec it closes all by itself and opened again. I thought it was the games problem but I opened the other games and same thing happened at almost all of them. Even with Skype! Do you guys have any idea about that? Thanks a lot in advance!