I've been sitting here working/typing the past few hours. My new 5,1 as quiet as it has typically been. Out of the clear blue sky it made this fairly loud, kind of scratchy sounding WAHH-CLUNK. It's late and quiet, and made me jump. And I would def not categorize this as any kind of normal HDD or other noise. So, uh, thoughts? The computer didn't skip a beat at all...no hang up, restart or other weirdness besides the sound, which stopped as fast as it had happened. Oddly enough, I seemed to hear a beeping of electronic equipment from my neighbor's immediately after the mini noise. Could it have been aliens or a gamma ray burst or something screwing with electronics? EDIT: It retrospect there's a small chance it could have come from my time machine drive, but I'm fairly certain it came from the machine itself.