Audio Line-In Port Not Working

I plugged a Shure mic into the Audio-In Port and is doesn't work. I'm using FCP Voice-Over but I get no audio on Soundtrack either. Worked with all the settings and preferences for audio. Also tested a second mic which also doesn't work. I read some people had problems with Audio-In Port after upgrading to 10.4.10. I ran a check for audio updates, there are none that I haven't installed. Why can't I seem to make a simple mic work when it's been so simple previously?

Your Mac does not have a microphone input, only a line-level input (in fact, no Mac has included a microphone input in quite a while). So you'll need 1) a self-powered microphone that outputs line level, 2) a USB microphone, or 3) an external audio device that supports microphone inputs, either a mixer that will give you line-level output or a USB audio input device. One possibility for a USB device that works for many people and that is relatively inexpensive (ca $40.00 US) is the Griffin iMic. It works with any standard personal computer microphone.

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