|Make sure you also try a different charger and a different outlet.|
Sometimes these cameras can be charged by plugging them into a computer (via USB), so you might want to try that too.
Do any lights come on or flash when you plug it in?
There is a fair chance that it is an internal hardware issue, in which case you'll have to see if it's under warranty. If it is, contact Nikon and have them repair it. Otherwise, it may be time to get a new camera.
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