It sounds like an electrical transformer or a server room. Maybe not that loud, but definitely a similar sound. Even after installing my games to the hard drive it is still pretty loud. I have a 1000 watt surround sound system and I'd have to piss my neighbors off to completely drown the 360 noise out. Is this normal? I'm new to xbox and if my PS3 made that much noise I'd be concerned, that thing barely makes a sound. I read that the xbox is loud, but never thought it would be this loud.