I've got some logitech z-560 speakers, and they worked just fine untill i reinstalled the soundcard drivers and software. the soundcard is creative SB live! 5.1 digital. i've changed the settings in the surround mixer to 4 speakers, but only the front speakers work. i'm sure they are properly connected.
If you've checked the settings in the mixer, you also need to make sure windows is setup correctly. goto start - control panel - sounds (depending on windows version) - under speaker settings I believe hit advanced.
You can also check the Logitech site. I'm sure they have a FAQ for that.
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