I was watching a couple videos yesterday on my Imac and periodically it would make the most unusual noise. I don't know how to describe it other than perhaps like two porcelain dinner plates when you slide one atop the other on a shelf. I know that sounds strange to you - and to me too. For a while I thought it must be my imagination or something else making the noise but it is coming from my Imac?
Anyone ever heard of such a thing?