Hello the issues I have with the renderer is a bit different. I am joining a screenshot to illustrate them.  In the top row you can see that since I didnt click on "only render" in the N menu unwanted elements show up in the renderings. ( the camera the outline of the selected object and the ray from the light object.) Is it normal? is this something to check everytime I make a render? I thought those wouldnt be rendered by default)

Secondly my main issue in the bottom row. You can tell that the light in cycles is set to have the same colour as in blender internal render. However the lights doesnt show up in the viewport and neither in the renders.

Moreover the light in the blender internal render, is set to cast shadows but no shadow ever shows up.