I am a switcher, was quite surprised when I had to get an external optical drive for our mini dvd's but all and all very happy!! (firewire 400) However, when I turn my (usb) external hard drive my mighty mouse subsequently goes bonkers when I move it. Bonkers being a description of what seems to be clicking from the mouse and error sounds from the machine. If I use another usb mouse everything is fine. Obviously, or so it seems, there is a conflict. Anybody have this problem, a fix????.. I like my new machine and mouse too! not likely to get a firewire enclosure for the HD in the near future, funding issues ;o) thank you for any help you can steer my way!