I have a mac mini, only had it for 4 weeks though its been on a lot. I've started to hear this sound as if a ball is being dropped on a table. Its become more and more frequent. Also I can now hear the HD churning away which I could have sworn I couldnt do before. Its still very faint but nonetheless audiable. I little bird tells me this could spell the end of the HD? Impending Doom and gloom?? Please help? BTW I've installed the SMARTreporter and its not found anything wrong with the HD. Its showing the green light!