I'm new to the whole digital recording thing, so please bear with me. I have a Presonus Firebox interface that I've connected to my iMac (OSX 10.5.4). It's powered up with one of those wall-warts and the blue light on the front indicates all is well. However, the Mac does not recognize the Firebox at all. Any tips as to what may be wrong or something I'm missing? I've called Presonus and listened to about an hour of bad jazz fusion on hold before giving up on them.