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That motherboard uses the Realtek ALC850 which automatically senses what's connected to the audio jacks. I've never had that Realtek but I have another auto-sensing audio setup and it used to (hasn't in quite some time) get confused about what was connected to the jacks. I had to tell it manually what the connection was from time to time. You might try that with your motherboard. According to the manual, you can disable the auto-sensing feature. If that doesn't work, I'd uninstall and reinstall the audio drivers. Your audio may have really died but if it thinks the line-out is a line-in, then my first guess would be a software problem rather than a hardware problem.
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