Can't select "Built-in Line Output" in Audio/MIDI prefs

I have audio on my MacPro going out "Built-in Line Output" via the mini-jack at the back to a receiver. Everything works fine.
When I open GarageBand's preferences to set up Audio Output it has defaulted to "Built-in Output" (the little speaker and jack in the front) and is grayed out, I can't select "Built-in Line Output" to send GarageBand's audio out the mini-jack at the back.
Anyone know what's going on here?

HangTime, Thanks for the replies and link.
The problem has solved itself, which is good, but I have no idea why or how, which is mildly off putting.
I went into system prefs and set the Sound output to "Built-in Output," thinking maybe that would "free up" Built-in Line Output for GB, which doesn't make sense, but whatever, none of it made sense. That had no effect in GB, same situation. So, I switched the system prefs back to "Built-in Line Output" and left things for a bit.
Then the next time I went into GB everything was fine. The pull down menus were available and I could select "Built-in Line Output." Weird. [insert head scratch here]

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Hello ckkzzzle,
I was looking into the issue you are describing and think I have a great article to help troubleshoot it. The article is called Apple computers: Troubleshooting issues with video on internal or external displays found here: http://support.apple.com/kb/ht1573.
Start here, and work your way down as needed:
Check connections
When using an external display be sure to check the following:
If you're using an Apple notebook, confirm the AC power cable or adapter is securely connected to the computer and the cable providing power to the display is also secure. It is always good to have your notebook connected to AC power when an external display is in use.
Confirm display adapters are fully seated in their respective connections and that they are supported models and for the computer and display. Refer to these articles to assist you with adapter compatibility and further configuration information:
Monitor and Display Adapter Table
About Mini DisplayPort to HDMI adapters
Apple Mini DisplayPort adapters: Frequently asked questions (FAQ)
Thunderbolt ports and displays: Frequently asked questions (FAQ)
Remove all display cable extenders, KVM switches, or other like devices and retest to determine if the issue is resolved.
If more than one video adapter is in use—or "daisy-chained"—troubleshoot by using only one adapter.
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hi
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HangTime, Thanks for the replies and link.
The problem has solved itself, which is good, but I have no idea why or how, which is mildly off putting.
I went into system prefs and set the Sound output to "Built-in Output," thinking maybe that would "free up" Built-in Line Output for GB, which doesn't make sense, but whatever, none of it made sense. That had no effect in GB, same situation. So, I switched the system prefs back to "Built-in Line Output" and left things for a bit.
Then the next time I went into GB everything was fine. The pull down menus were available and I could select "Built-in Line Output." Weird. [insert head scratch here]

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¯\_(ツ)_/¯

Can't select "Built-in Line Output" in Audio/MIDI prefs

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