Line-in not working with microphone?

Line-in not working with microphone.
I have Mac Mini Intel 1.83 GHz with 10.4.8
I have tried plugging 3 microphones into the line-input on the back, also on my wife's Mac Mini (same model, os), but I cannot get to record into the Mac.
I've been into System Prefs and set input to Line In and slid the Input Volume to high, but nothing.
I know the Microphones work because if I plug them into a Griffin USB/mini jack adaptor and do it that way by selecting iMic USB audio system from the Input in System Prefs all works fine.
But I need to use the mic with the Line-In.
Any ideas why this is not working?

The line input on the mini requires a 'line-level' signal, so the only microphones that work are ones that have an amplified output. Standard mics don't generate enough voltage to drive the mini's amplifiers.
That's the reason the mics work with the Griffin device (it has an amplifier) but not the mini directly.

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