I had my brand new 15" refuse to find the system disk after booting it as a firewire drive recently so I had to install a new OS. Ever since doing that it squeaks. Tiny little squeaking noises coming from the general under-the-keyboard area. It's like a little needle tapping and then this little digital squeaky beep sound. It only happens when it's sitting there awake. When I put it to sleep or make it do something processy (like open Photoshop) it stops. Anybody got an idea what that's all about?