I've come to the conclusion it may be the motherboard - 2 complete reinstalls of XP later and still no better; the back ones have even stopped working!
As for the pinout - I tried swapping the data+ and data- lines in response to advice from a friend, but that made no difference. I'm not keen to play with the +5v and ground lines for risk of frying the thing.
So current diagnosis is knackered motherboard - sound reasonable?
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I can't understand why people are frightened of new ideas. I'm frightened of the old ones. -- John Cage (1912 - 1992)
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