I've been noticing a slight crackling noise, ranging from virtually undetectable to significantly annoying, in my one-year-old Mac Mini. The crackling occurs intermittently whenever the audio driver is activated, independent of software, choice of sound files or cables/headphones options. I thought I might be getting some kind of weird interference from the iBook that sits next to it, but when I shut the iBook down the crackling continues. Is this a known issue on the Mini, or am I the only person having these particular symptoms? Is there anything in Snow Leopard that might be causing the trouble, or should I assume it's a hardware thing?