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Powered USB hub engenders strange behaviour

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Bought a cheap powered USB hub as my scanner would not run properly from existing USB ports: the hub and computer work fine, stable, will reboot fine etc, however when I shut down/power off, there is a never ending series of long beeps of different lengths, the lights on the front of the box half light up, the power supply light glows, the network lights flash - even if I unplug the computer.


So it seems the USB hub is powering my motherboard - hmm. Has anyone encountered this before or is it merely faulty?



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