No more audio out on my Mac Pro!

Abruptly, my Mac's line out jack (and internal speaker) has stopped making sound! An external Firewire audio interface works just fine.
Things I've tried:
*Restarting the computer
*Unplugging the jack that I had permanently connected from the line out in the back to my speakers -- to verify that there's no sound coming out of the internal speaker
*Making sure volume's not muted
*Going into System Prefs > Sound and mucking with things -- routing audio elsewhere, trying system beeps, etc. Not a peep...errrr....beep.
*Routing all system audio through my Firewire audio interface. This works fine -- audio does get sent out correctly through that interface. However, I need my Mac's line out to work.
Bottom line, anything that's being sent out of the line out is not coming out anywhere -- not the internal speaker, not the line out jack.
Any ideas what could cause this? Any ideas for things to try?

when i wiggle the front jack i get the sound back.
With that stement I would say it is a faulty jack except for the fact that you say it happens in the back jack too.  I suppose a fault in one could affect the other.  Other than replacing the faulty jack I see no solution.

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