I have a 2nd monitor and hooked up my xbox 360 to it. I have it connected through HDMI and then have a regular audio jack going from the monitor to my mac pro. When I open up my sound preferences and select: Line In - Audio Line In the "Input Level" bar goes up and down meaning it is registering or hears the sound coming from my xbox. For some reason though, the sound will not output from my Mac Pro. My speakers which are connected to Line Out: Built In Line Output still outputs sound coming from my mac pro but it won't output the sound from my 360. Is there a remedy for this? So quickly again. Line In - Audio Line In is "hearing" the sound from my xbox 360 as the "Input Level" bar goes up and down. Line Out - Built In Line Output still outputs sound from my Mac Pro but not the 360. Is there a way to fix this?