okay guys i just got a used mbp from my uncle. he bought it right before the update to the 2.4 versions came out. the left third of my screen is slightly darker than the other 2/3 of the screen. is this defect of my screen? the mbp has applecare. is this covered by apple? i really only notice it when i turn the brightness down. when the brightness is highest you cant really notice it. any ideas whats the problem here?