External speaker sound jack not working?

Altec Lansing VS2421. Not a bad little 2:1 speaker set up for the money. They work fine on my G5 Quad, but not on the iMac. I get that 'interference noise' when I plug the speaker connector into the sound jack. But no music, nada, niet, zilch, non.
This iMac has been plagued by all sorts of problems recently and this is the most recent one to give me a headache. Does anyone have any ideas, what might be causing it?

Miriam,
Thank you for the link. Really useful information. However, I'm not certain, but think my problem isn't connected with ground loops. It's more basic than that.
If I mute the internal speaker of the iMac, whilst leaving the External speakers on, there is no sound at all. If I twist the external audio jack around in it's socket on the Mac, I get feedback and what I think is AC hum. But no audio signal. And if I switch the internal speakers on, I get a normal audio signal.

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