I have a MPB, and recently the computer had begun to make a clicking like noise, from under the left palm rest, which I believe is where the HD sits. Is this a warning sign? Is my HD beginning to go? I haven't had any problems thus far, but I dont want to wake up one day and lose everything. I've begun to back stuff up, but was wondering if I was right to be concerned, or am I just over reacting. Anyone else dealt with something like this?