Before you take any other advice, I think the standard advice would be to press and hold both the 'Menu+Center buttons' for about 5-10 seconds. That should reset the iPod if not responding. Then plug it back into USB hub to see if the device registers.
See how that goes, then report back.
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As human beings, our greatness lies not so much in being able to remake the world (that is the myth of the Atomic Age) as in being able to remake ourselves. —Mohandas K. Gandhi
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