Nikon D5100 Audio doesn't work?

I'm a little new at this camera stuff, and well, at first my audio worked fine, when I record videos and such. But now I just don't hear anything. Is there a volume bar on it? I never dropped it, or did any damage to it. I DID notice you can change the audio settings to Auto, High, Medium, or Low, but I still don't hear anything when I record, or when I playback the video. What should I do?

Check the Audio cable. Connect the cam with TV and play.
AV cable should be proper and plugged perfectly in the cam as well as in TV.

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