(I'm assuming this is the case for G5s too thought I can't find any reference on apple.com. My audio line-in port does work using my cd player line-out. So it seems this is the problem/solution though I haven't gone out and bought a new pre-amp mic yet to test.)
Power Mac G4 (Mirrored Drive...
I no longer have mic input for ANY pgm. iMovie, PEAK, or the Sys. Pref test. I did the last time I used these pgms months ago. I just installed Skype and plugged in the input mic. I could hear them and they couldn't hear me. The mic works on windoz. I also see the mic input level going to zero...