They just don't want to talk to each other. I stick the Karma into the dock and nothing happens. It boots (annoyingly!) but the PC doesn't see it connected, and if I start Music Manager, that doesn't see it either.

It's connected to the PC via USB2.0

Any thoughts?
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Mk2a RioCar 120Gb - now sold to the owner of my old car
Rio Karma - now on ebay...