Is it possible that the USB port you are using is unpowered? I haven't seen one in a long time, but some USB ports are unable to supply power to the plugged device. If that's the case, you would still be able to mount the Kobo on the computer and transfer books, but the battery would not be charging.
Try charging using another computer, or a cable box, or a PS3/XBOX360. Alternatively, as suggested above, use a USB/AC power converter, which comes with blackberry's, kindles, and other devices. You can buy one for $5-10 at a computer store.
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