My old mbp unibody just started going to the vertical/horizontal blue/grey lines thing recently. i was just researching how to clean fans, thinking it probably has something to do with overheating. then I rocked the computer and it went bad again, and when i firmly but gently put it down again, it went away. so now I see it is probably some connectors or something? I am technically proficient enough to clean the fans, to give you an idea of where i'm coming from. Can anybody tell me what is going on here?