Hi guys, I noticed there is a black dot (quite noticeable) in my bmp 13" mid 2012. I am pretty sure it is not a dead pixel since i still can see the dot even when my macbook is turned off. I read somewhere in the web saying it maybe a foreign particle/object/dust that slipped through behind of the screen.. @@ please correct me if i am wrong. does anyone here have experienced the same issue? how come dust/particle can manage to pass through and reside in the back of the screen? appreciate any comments on this issue. thanks!