Just a short question for MacBook Pro 17' owners of all sorts: Did you ever noticed a wear and tear on the fans over the years you had your notebook? How long do you think the fans will last? So far I do not have a problem with mine, however when I replaced my HD and Ram, I noticed a dust build up inside the fans. Did anybody ever lost functionality of a cooling fan through dust or age ?? Are there any signs before a cooling fan dies, any danger killing the machine because of a failing fan? Thanks a lot !!