I hope there I am just being a noob but I got my new mac pro out of the box just minutes ago and plugged in my old pc speakers to the sound out on the back and nothing, the internal speaker continues to function and the self powered externals do nothing. If I plug the external speakers to the headphone jack on the front they work fine. The internal speaker shuts off and the plugged in speakers work properly. Am I missing something I admit I am new to Macs and am hoping I am missing a setting or something. I am a little frantic right now its a long ship back to the factory but for the money I want everthying to work. Any ideas? Thanks.