Alexandre really helped me out: Per Apple Article ID 86671, it says: The PowerBook G4 audio line in port takes signals from audio equipment, including line-level devices such as amplified or self- powered microphones, and is specifically designed for high-level audio signal such as the signal from a powered microphone. If you use a nonpowered microphone with the audio line in port, it will result in a very low volume signal, or possibly no signal at all. Third- party options, such as Griffin Technology's iMic, allow the use of many mic-level sound input devices with your computer. Article ID: 86771 Date Created: June 10, 2004 Date Modified: June 15, 2004 Lee On Feb 26, 2006, at 7:55 AM, Lee Licata wrote: > Dear List, > > I am trying to set up a microphone to use with my 17" PB running > 10.4.5. This radioshack mic -headphones as two plugs. > > I plug the device in, and while I can hear fine thru the > headphones, I cannot get sound into the computer using the microphone. > > I have gone to the Speech prefs panel and selected line input for > the mic. The sound bar does not move when I speak. > > Did I miss something? Should I buy a different mic?