No audio out on internal speakers or headphones from external device

I'm using an intel iMac 17" I tried to plug in an external cassette deck, and listen to it through the internal speakers. Even though all system prefs for audio work as expected, and I can see the audio meters on screen operating, nothing will induce it to play sound either through the internal speakers, or headphones.
The audio is certainly going in there, as it recorded perfectly in iMovie. The internal speakers work perfectly for alerts, iTunes, the web, everything. But no external device will work.
I've tried an iPod, a microphone, and a cassette deck, all with the same result. I've launched Garage Band as this can upset the midi player, but it's fine. I've visually checked the settings, no problem.
As an alternative I also tried an iMic and stopped using the jack input on the iMac. Still nothing. I plugged headphones into the iMic, nothing. No audio will play unless it's already on the Mac. External audio goes in there and dies before it reaches the speakers.
All the visual info I get in the sound panel regarding connection options, output etc, is exactly as expected, I just can't get any audio at all.
Does anyone have any suggestions? There's only a few day's warranty left...
Many thanks.
Quicksilver G4 Mac OS X (10.4.9) Programmes in regular use are Freehand, Photoshop, Freeway, Keynote, iMovie, iDV

Hello David,
Thanks for the pointer. I looked at the website for Linein, and I already have Audio Hijack pro installed, which contains this application. When I ask AH to record the system audio, the volume meters are dead, I hear nothing, and record nothing - unlike iMovie.
When I do ask it to record, I can hear a thumping sound from the Mac speakers, but nothing else.
I'm really desperate for a solution to this; I can't understand why it's so hard to achieve. If it was just the line in socket I'd suspect that, but a USB connection as well? I don't understand that at all.

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No audio out on internal speakers or headphones from external device

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