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All USB devices 'unknown'

3K views 1 reply 2 participants last post by  dai 
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I have a tiny U64 with an Athlon 64 processor, running XP pro. when plugging in any USB device they show up as 'unknown device'. I have rebooted ,unstacked the USB controllers and hubs, checked drivers, unistalled all devices!! Yet when I plug in a plug and play device, it recognises that a device has been inserted, then 'new hardware' installed appears shortly followed by ' the device has malfunctioned' then 'unknown device'. None of the devices power up i.e 'DANE ELEC' data stick, Targus mouse, logitech tracball' and so on.The Bios says USB's OK. Completely stumped????
 
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