Audio line out mysteriously doesn't work due to software

My topic doesn't seem to fit in with any of the forum topics, so I chose this one as the closest fit.
Now, my line out audio stopped working. Now before you think I'm crazy and I submitted a question for what is obviously bad hardware, listen to this.
This happened before about a year and a half ago. I thought it was a faulty line out jack, and since computer was still under warranty, I took it in. They told me there was nothing wrong. I took the computer home and it worked just fine. hmmmmm
Now it happened again. I checked my speakers first by connecting to another computer. They worked fine. I rebooted the computer in Windows and the line out plays just fine into the external speakers! I reboot back into OSX and it stops working! Any ideas what is going on?
Of course I have the line out selected in the sound preferences. I can select internal speaker and I get audio from the computers speaker. Go back to line out and it's a blank. And yes, the volume is turned up.

Here's my advice...
Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, then reinstall the combo update for Intel-based Macs...
http://www.apple.com/support/downloads/macosx10411comboupdateintel.html
Repair Permissions afterwards, reboot.

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