help please. i have a year with a mackbook pro an it's work excelent. recently i leave my laptop doing a rip process, when i came back the screen was 'dirty' (a crazy carachteres forming down lines in the scrreen). I restart it then. but when it's staring, the apple sign apears 'dirty' again, and before that, a message in 4 idioms tell me that i must have restart my machine.. i'been doing this several times... and the same happends again and again... help me please... i have to work!!!!