Headphone audio not working on Lion Macbook Pro

Hello. I am having trouble with my headphones in my Macbook Pro. The OS is Lion, and ever since a couple days ago, whenever I plug my headphones into my Macbook, the audio doesn't change at all. The sound continues to come out of my speakers and it doesn't change. The strange thing is it seems to register the headphones regardless, as when I check my Sound Preferences with it plugged in, it says that the 'Input' device is 'Line in' as opposed to 'Internal microphone' which shows when the headphones aren't plugged in, yet the 'Output' device remains 'Internal speakers'. This is very annoying as I use my Macbook to produce music am limited to only using monitors now.
Just a note, I have tried it with more than one set of headphones too.
I appreciate any help I can with this.
Thank you.
-Ben

Oh! I appear to have sorted it! The 'Use audio port for' option in the Sound Preferences was set to Input and not Output.

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