Every once in a while the Sony VAIO speakers on my generic PC (Abit NF7-S V2.0 motherboard) make a weird sound when nothing is playing through them. The sound is a bu-bup bu-bup bu-bup bu-bup, not high pitched and not low just weird.
I also get this when I have my iPod attached to my Jimmy's cassete player. That sound appears randomly and over songs that are currently playing.
Maybe the sounds aren't really the same but they sure seem the same when I hear them, any guesses?