Found a problem with my Mac Pro.

Even when an audio device isn’t selected, there’s a constant, noticable “BLAAAHHHHH” noise in the background.
Almost like a loose connection?

What really sucks is if I hook up my stereo and turn THAT up, it amplifies the music, AND that sound… so if nothing’s playing that’s all you can hear.

Clearly a defect, I’m not sure what to think about it. Anyone else having this problem? E-mail me.

UPDATE: Apparently this is an issue outside of my Mac Pro, and probably with my house’s wiring or other devices interfering… etc. http://docs.info.apple.com/article.html?artnum=86655