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When there is a capital F, and in front of it is a triangle, it means there is no lens in or a non CPU lens.
If you did install a very old lens, or a lens from an other brand, the camera can't use the autofocus and picture settings. You only can use these lenses in manual. That means not only the focus has to be set manual, but all other things like time and aperture.
In the (English) manual, on page 183 you find d9 from the menu settings (d; Shooting / Display): LCD illumination.
At the default setting of Off, the control panel backlight (LCD illuminator) will only light while the power switch is in the D position. If On is selected, the control panel will be illuminated while the exposure meters are active (pg. 35). Select Off for increased battery life.
This option is available in all shooting modes.
So you have to go to the menu settings d9 and switch it on again.
On older cameras, don't lock the ring. You need to turn the aperture ring in order to control the aperture.
On newer cameras, turn the aperture ring to its smallest aperture (largest f/number) and lock it. You control the aperture from the camera, the same way as on a lens with no aperture ring. If your camera displays "FEE" on the LCD panel when you put on the lens without locking the ring, then you'll need to lock it.
If you're still not sure whether you need to lock it, please reply to this post giving the model(s) of the camera(s) you want to use with this lens.
If you need a manual, you can download one from the manufacturer's web site at http://www.nikonusa.com/pdf/manuals/lenses/AF/AF50mm.pdf
The lens has a plastic mount. Look closely at the rear of the lens, you may see that the tabs that hold it to the camera have broken off. You can get a replacement mount at UScamera.com or Nikon in California