Did you buy this camera used? I'm thinking you may need to do a two-button reset to restore your camera to the factory defaults.I have D7100. My camera dosnt focus when i half press the shutter. When i press the af-l button few second the camera try to focus .when i switcht to live view and press the af-l button. the camera focus in a meter second.
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To do a 2-button reset hold down the green dotted ISO and EC buttons on the camera body and watch the top mounted LCD screen. This resets the functions found on the shooting menu. You can also navigate to the shooting menu and select Reset Shooting Menu > Yes.It's a new camera. Which are the two-dutton?
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I erset the camra. It focus only in live view