Problem with analogWrite on digital pin 3 (PWM)

Hi!, I'm having a problem with analogWrite on digital pin 3 which is PWM pin when fading a led. I don't have any ouptut and the led does not turn on. Does anyone know the reason?

did you write some code or just hook the led up to pin 3

You either wrote the sketch incorrectly or wired the LED incorrectly. Since I can't see either your sketch or your wiring I can't be more specific than that.