I'm trying to use a Blue Snowball USB microphone to record in Garage Band (run on Mac OSX Snow Leopard). However, Garageband is not recognizing the Snowball when I go to Preferences. In addition my mac is not recognizing the snowball when I go under sound within system preferences. The power light is illuminated on the Snowball. I tried the Blue on my friend's mac computer and it also did not recognize the mic. Can someone help me?