Thanks for the reply - yep it does look like a dodgy USB cable, but I've tried a couple of other USB cables that I know are OK, and the dock is still behaving in the same way as before (3 lights scanning for a second or so, then no lights at all)... are there any other checks I can do? (I'm going to try a fresh Jessie image tonight, see if that makes any difference). Cheers.
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