No sound with input to audio line in

All of my other audio works fine. I can play CDs and video files like AVI and sound is perfect. I am using the Apple pro speakers. You can't get audio from the line-in on the speaker jack either. If you go to the audio prefs it shows line in and port is audio-line in port. The input level meter shows activity that looks like the audio currently playing. If you unhook the audio cable (monaural) the sound level meter goes to zero. The output shows external speakers and port is built-in audio. I am trying to listen to the TV audio while I watch the composit video on my monitor. The video part works perfectly. It is like the audio in is not connected to the audio out. Any ideas??
Bob

I was a bit confused by your description of what is going on with your system, so I'm sure you;ve already done some of this stuff. Having said that, here are a few suggestions...
1. Did you change anything in the Audio MIDI Setup application? It is located in: Applications: Utilities
2. Did you hit the Mute button on your keyboard?
3. Did you plug the cable into the correct port on your Mac?
4. Did you double-check your setting in System Preferences: Audio? Input and Output?
5. Are you coming out of the Audio Out on your sound source?
6. Have you tried any other external audio source with success?
G5 dual core 2.5 ram   Mac OS X (10.4.3)  

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