Hello cjane23. Welcome to Android Forums. It could be a total lack of battery charge all the way to a software/os problem. For the best help you will want to check into the support area for your phone. Here is a link to that area: Nexus S - Android Forums
Best of luck to you and thanks for using these forums.
I would try different chargers. If the phone does recognize a charger and still won't turn on you may need to reset using your hardware keys. You can also try using a diff battery if you have one available.
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