Sorry to post this here, but i don't know if this can be here or in other category... If wrong, please send this to other category: I bought a MacBook Aluminiun - Intel Corel 2 Duo 2Ghz - 2GB RAM with Mac OS X 10.5.5 two weeks ago. And, since I bought it, the same problem/issue occurs. When I open any picture or video (especially with dark background), the screen shows any kind of "interference". Horizontal colored lines. The problem can be viewed at this address, when i post two examples to best describes: http://www.youtube.com/watch?v=5agNdhj82DU or http://www.youtube.com/watch?v=y5OVSrGYh5E Does anyone know what can be this? How to solve? Thank you!