I had this problem too. You're going to have to restore it with iTunes.
If that doesn't work then I would suggest taking it on and off of the docking station until it works. I know this sounds really primitive but this is what I ended up doing and now it works fine.
One last thing, if you recently upgraded your iPod's firmware then that might be what is messing you up. Sometimes docks aren't compatible with the newer firmware Apple puts out so you might have to buy a new dock unfortunately. But if your iPod was jailbroken on a past firmware you can use this video to downgrade it to when it worked with your dock.
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