Freezer wouldn't go into defrost mode

I first noticed that my fridge was not getting cold, after some investigation I realized that the coil was frozen in the freezer, which blocked the flow of cold air into the refrigerator. I noticed that the heater element was not getting hot, so it couldn't melt the ice off of the coil. I first started out by changing the cheapest parts first...The first was the defrost thermostat (the piece that clips on to the coil), no luck. Then I replaced the heater element itself, no luck. Then it dawned on me, I first noticed my problem about a week after a major power outage (hurricane Irene)...When the power came back on, it must have zapped my defrost control board. I changed this out (it's located in the fridge section on the top left hand side under a molded piece of plastic behind the temperature controls. The new control box that came was orange, and the original was black...This didn't prove to be a problem, because after a 15 min. swap out, my fridge now works perfectly. So after about a total of $100.00 spent on parts my fridge now works perfectly.