Strange microphone-headphone confusion

Hi macbook users,
My external microphone stopped working from one day to the next. I thought it was the battery and purchased a new one, but after plugging it in and testing with garageband, no wound was picked up (except sounds uttered close to the computer).
After testing to figure out what was wrong (I started with the microphone, which works on a camera) and garageband (the built-in input option never appeared), and a PRAM reset (suggested online for a similar problem) I ended up looking at the sound preferences (finally).
Here is where it gets interesting :
I noticed that the microphone being plugged in or not had no impact on what the computer recognized. Basically, in System Preferences > Sound > Input, it always just says "Internal Microphone - Built In".
BUT, what is really interesting is that in Output, when I plug the microphone in, it switches from "Internal Speakers - Built In" to "Headphones - Headphone Port".
Which means that in the past 48 hours, my computer stopped recognizing my microphone as such, and now thinks it's a headphones set.
I cannot find any trace of this problem on the Internet.
Does anyone have an idea what happened, and how one could go about solving this?
Thanks,
Lawrence

I'm having a problem identical to this, which started when I updated my software this morning, including the latest version of the Linux kernel.
[zauber@myhost ~]$ lspci | grep Audio
00:14.2 Audio device: ATI Technologies Inc SBx00 Azalia (Intel HDA)
01:00.1 Audio device: ATI Technologies Inc Radeon HD 3870 Audio device
If there's any other commands jeoda or I should post the output of, please let us know.

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Cobra wrote:
I just got a new computer with a Foxconn TLA-776 case that has microphone/headphone jacks on the front. There are 7 seperate plugs that come from these jacks. Ground, Right Out, Right Return, Left Out, Left Return, Mic Power, and Mic In. I tried plugging these into the white connector on the card with 0 pins, but they didn't fit correctly. Is there somewhere else these connectors are supposed to plug into on the card? They were originally plugged into the motherboard's onboard sound.
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Please click the White KUDOS "Thumbs Up" to show your appreciation
Frank
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Strange microphone-headphone confusion

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