I just got a Mac Pro and my old Altec speakers work fine from the headphone jack. When I plug them into my line out jack however, all sounds (except for the mistake chirp) come out of my internal speakers.
I just got a Mac Pro and my old Altec speakers work fine from the headphone jack. When I plug them into my line out jack however, all sounds (except for the mistake chirp) come out of my internal speakers.
This is a bug in OS X. You need to go to the Sound Preference Pane and select the output you want to enable (line-out). I have a USB headset and when I unplug it all sounds default to my MacPro's internal speaker instead of my line-out (external speakers). Annoying to say the least. I use a program like http://www.versiontracker.com/dyn/moreinfo/macosx/26839 but don't remember the exact name (not at home computer).
This is similar to the problem of having audio out of both the internal speaker and the line-out simultaneously while booted into Windows XP SP2 via BootCamp and something I wish Apple would fix.