Audio line in no sound

Hooked up an external radio to my line in. No sound from the speakers. Went to System Preferences>Sound to check things out.
Output is set to Internal Speakers
Mute box is unchecked
I can get system sounds, cd playback and internet audio just fine
Input shows Line in as Built-in Input
Input volume set all the way up
Input level meter is reading and showing input just fine
Mute box is unchecked
I tested the setup on my pc laptop by unplugging the connector from my iMac and inserting it into the line in connection port on the pc. Works fine on the pc.
Anything else I can do? I think I have a warranty issue, but I don't want to contact Apple unless you intelligent people agree.

Hi jtaggart2
To pass audio from input to output you'll need something like LineIn.
http://www.macupdate.com/info.php/id/11333/linein
Dennis

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