If your lens aint coming ont when you turn it on then here is a neat trick you can try to actuall solve the problem
with the camera off ,, grip the lens with your fingers if you can or a large tweezer.. Press the power button and pull out the lens at the same time.. wait a minute or two and push the lens back in if it aint going in on its own. repeat this a few times until it starts to move in on its own..