Not sure from where in my macbook it's coming, but it started recently. The only thing that changed recently is that i relocated it to a different city, but i don't see why that would cause this. Clicking isn't really the right word to describe the noise...it's like a sweeping click. "Shtock." And it gets louder if i increase the volume on my computer, but it's definitely not coming from any application. And it usually goes off every minute, but sometimes there are breaks of two minutes or so. Any input would be appreciated! Edit: Never mind, it doesn't get louder as i increase the volume. The volume of the noise seems to fluctuate on its own.