I just got my new Mac Pro today. As a musician I was hoping this would be a very quiet machine, but when I turned it on I right away noticed that there was a ringing sound coming from the machine. It's a constant pitch, kinda like a sine wave (the pitch is a high G). It's pretty subtle, but it gets annoying after a while (feels like having tinnitus), it gets louder/softer depending on where I position myself. Is this a common sound for all Mac Pro or is there something wrong with my Mac? Are anyone else experiencing this problem? Do most people have their mac pros in a soundproof cabinet? Any insight would be greatly appreciated.