Audio line-in not working on MacBook late 2008

The audio line-in on my aluminium MacBook late 2008 has stopped working.
The built-in microphone works like a charm, but when I connect an external microphone the computer does not register sound any more. I have tried with several microphones, and I have verified in the settings that the sound input is set to line-in (I don't know exactly what the setting is called in English, in French it's "Entrée ligne". Anyway, it must be the right one).
One last piece of important information might be that I hear a scraping sound in the speakers when I connect the microphone. After that, nothing.
Is this a hardware problem or is there anything I can do on my own to fix it?
Thank you!

The built in iMic works
I assume that's a typo and you just meant the "Built-in Mic"
when I turned it on a screen came down that said I needed to restart my
computer. So I assume that means some sort of signal is being recieved by
the line in....
I wouldn't call that a safe assumption, it jsut means your computer crashed. Pretty rare for Mac OS X, but it does happen.
Are you using a PPC or Intel based Mac? I'm guessing intel since you implied that you set GB's prefs to Line-In (this can't be done on a PPC Mac). Make sure GB's Input PopUp menu is set to line in and try creating a New Basic Track.

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