Box Light\Spotlight\Point light doesn't work

[The chaser]

I have built a room with a window and a spotlight. Then I placed the spotlight in front of the window, a big FOV and a big radius. No boxlight! -> and still it won´t work. What could be the problem?

A window, you say. If the SpotLight casts shadows, be sure it doesn't collide with the window. And, I think that if you put a 180 FOV it doesn't work.