Frigidaire Refrigerator not cooling

Our Frigidaire refrigerator quite cooling. I did some research and the suggestions were that I replace the starter relay. I did but fridge still does not get cold. I can feel the air flowing in. Also I can go in back of the fridge and hear the compressor kick on, but the frifge still does not get cold. Deos anyone have any other suggestions that I can try. I would really hate to go out and buy another fridge especially in this economy.