No audio from Line In on my iMac G5

Hello,
I have a problem since some time now. I looked for similar topics and nothing seems to match. Here what it is.
When I plug in a microphone in the line in jack (yes, the correct one, I have a VoIP headset), I don't have any input. I can test for example using the LineIn software (to hear the input on the output), or by recording a track in GarageBand. When I go to the System Preferences, in the Input subsection of the Sound section, if I choose built in microphone, I can visually see there is a signal, and using the previous methods (LineIn and GarageBand), I can confirm it. But whenever I change it to line in, there is no signal, neither is there using the previous methods.
I checked the Audio Midi Utility settings, everything looks fine. Additionnally, I am (almost) sure it used to work. I am also sure my headset works (I use it on two systems).
Does anyone have an idea ?

I have a new Intel Duo and am having this problem.
I have a similar problem with a standard Dynamic
Microphone trying to record into Garageband.
Does a standard microphone not work? I was really
hoping to avoid buying an extra conector like the
iMic.

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