Audio output no longer works

I have a new Mac Mini that I got up and running about a month ago. A couple of weeks ago I installed a bluetooth device, a headset I also use with my celular phone, to use with Skype. So far so good....but when I tried for the first time to fire up GarageBand, sound output was setup to go through the headset. So in preferences -> audio output, I selected "Built-in audio". From this moment on I haven't had any audio output at all. I turned off the headset, restarted GarageBand, and got "bluetooth audio failed", tried a reboot, tried deleting the bluetooth device and turning off bluetooth, rebooting again, and still no audio. Other audio applications work fine--sound from games, media, etc. come out the built-in audio. But Garageband still is silent. In the preferences there are no more references to the bluetooth hardware in the drop-down lists for the audio devices.
Does anyone know how to fix this? I have been searching the discussions and Apple knowledge base artices for a while and can't find anything.
This is GB version 2.0.2 (50).
Thanks for any help!
Bill Nassauer

In the system prefs, under "Sounds", the only device listed is "built-in audio", and it's selected. I've already setup the GB prefs, and they're still fine (see my original message). I've never played with the audio midi setup, but taking a look for the first time, it looks normal--properties are shown for "built-in audio", and that's the only possible selection...nothing muted, and volumes normal...

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The strange thing is that the sound card does in fact work; e.g. the sound test for "HDA Intel PCH", the first entry in my KDE Audio Settings, works. But the entry "default" does not and I suppose that is also the device that VLC is complaining about.
I've tried blacklisting the HDMI driver and switched to the other audio output modules in VLC. I've also checked I'm still member of the "audio" group.
Edit:
P.S. Solved this myself. I had a USB-to-MIDI adapter cable plugged in during boot, which seems to have been causing these problems. I suppose systemd thought it was a USB sound card? I was wondering why dmesg said something about USB sound when the computer doesn't have any USB sound devices. Hardware detection epic fail. Although I guess the cable counts as a MIDI device at least, so in a way it's correct.
So it looks like I'll always have to unplug the MIDI cable before rebooting.
Last edited by Morn (2012-11-23 19:24:00)

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Godly19 wrote:
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The audio output mostly works when headphones are out in, but has a tendency to cut out from time to time. Without headphones, Audio might start working again briefly from time to time, but most the time it doesn't. Any ideas on what is wrong with it and how to fix it?
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Anything to try before returning
This question was solved.
View Solution.

This is where your web support portal is.
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UserIsNamed wrote:
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