>The noise is new and prolonged. Instead of the camera 'click' >of the shutter snapping - it sounds more like it is slowing >dragging.
Try using a good AF target in daylight.
>I haven't tried resetting the camera, but will try to decipher >how to do that!
You can reset the Shooting Options in the Shooting Menu (camera icon) and the Set-Up options in the Set-Up Menu (Wrench icon).
If that doesn't solve the problem, take the battery out of the camera, then turn the camera On. Leave the battery out of the camera for a few hours. Turn the camera Off before reinstalling the battery. If that doesn't solve the problem, the camera requires repair at Nikon Service or a Nikon Authorized Service Station.