I have set my MBP on a stable surface, yet it still produces a small tick sound every 15 seconds or so. Another user posted this in my previous thread: "It may also be this: http://www.youtube.com/watch?v=mJmpervXe9M Just take the bottom casing off and remove the black piece will two little silver pokey things. haha I don't know how else to describe it. It scratches against the bottom casing when there is pressure on the bottom. I don't understand why its there but taking it out does nothing. " So it could also be some part/surface doing friction with the case's bottom. What should I do?