When I plug the battery cord in to my mac pro, it says it is charging, but no light comes on and the charge is still low. What's going on?

When I plug the battery cord in to my mac pro, it says it is charging, but no light comes on and the charge is still low. What's going on?

Good grief!  I had not plugged the USB jack all the way into the headphone port on the iPod.  Having taken that action, the iPod shuffle works great.  My bad, as they say.

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