My 4th generation iPod won't charge unless it is plugged into my computer! Why won't it charge on a wall charger or iHome?

The only way i can charge my iPod is by plugging it into my computer. It won't charge on any other computer and it will not charge on any iHome or wall charger. And yes i have tried charging it on different iHomes and wall chargers! Why is it doing this?

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