Okay, I just searched google and did forum search and was unable to find anyone describing my exact problem soooo, here is goes. I just got a new 15" MBP, and I am loving it. I like to lay in bed sometimes when watching TV, and place the Macbook on my chest while I browse the net and chat with friends, I am sure we are all guilty of this. haha. It's sorta comfy. Anyways, this is when I first noticed this "tink" noise. It is very light, and distinct, and definitely metallic. I can only assume it is the HD head parking or whatever. However, in efforts to calibrate my battery, I allowed the battery to go completely dead last night. I have yet to plug it in to charge this morning, but I was handling my MBP anyways, just to get a feel for the new size, and the "tink" sound was still occurring-- even in this state of "deep" sleep. Am I wrong in assuming that this sound is my HD? Moving the computer around quickly doesn't always produce the sound 100% of the time. But sometimes I get a single "tink", other times a couple in a row, and sometimes I can get movie it in such a way that I get consecutive individual "tinks." I am just perplexed that this is all happening while the computer is essentially OFF completely... Is this sound actually the case and caused by the pressure of my chest? (I am skinny 115lb guy, the computer rests on bone essentially. haha.) When I experienced the sound while operating the computer, I did not experience any system lock-ups or anything. Is this just a superficial sound? Or something worse? haha. I am thinking it is nothing. Any ideas?