USB port problems: Help welcomed.

When plugging any of my iPods into the computer via the USB port, I receive no reaction.
A half-way full battery becomes frozen on the iPod and that is the absolute only reaction I get get.
I've tried using different USB ports on this computer and have even switched the cables I was connecting with to no avail.
My iPods can all be charged using the wall charger. It is almost as if the computer is not recognizing the cable.
That said, I have had iPods for quite sometime (my first was a 20GB) and have never been faced with this problem before.
All help is appreciated!

There are various things you can try depending on whether you use a Mac or Windows.
However, you've left out this info.

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