My cornsnake won't eat. It is a amalenistic corn thats 21 inches long and maybe a half inch thick. She hasnt eaten for 5 weeks now and just hides all day, she isnt shedding or anything. She has plenty of water, hides and the temps are 90 on one side and 82-84 on the other side. Shes in a 20 long for a tank. I try offering her frozen daily and she wont eat it. She was offered live on 2 seperate occasions as well and continues to not eat. She is captive bred too. I haave had her for 2 months and the first month she ate fine and i dont know whats wrong with her all of the sudden can some one help me out?

In my opinion your cold side is a little warm. 78 should do it. Also i think the tank might be a bit long for the snake. They get stressed out in to big tanks.

You do defrost it , right?
try to feed a live pinkie, rub a anole against the food to scent the prey or brain the food item( just use a knife and stick it in the head of the mouse and expose the brain a bit(i know kinda gross). Also check the humidity in your setup.

Yes i defrost the food. A tried cutting a little bit of the nose off to make blood nad he still refused. I brought home a couple live pinks around an hour ago and he wouldnt heat them. I rubbed on of my pet anoles against it and it still wont eat.

How often are you offering food? Leave him totally alone for a week and try again. You may want to put him and the mouse in a rubbermaid bin or paper bag and leave him there for a while/overnight (be sure he can't get out or put the whole thing in his tank). His cool side is a bit warm, do see if you can get that down a bit...what type of thermometer are you using? He's a bit young for a seasonal change or deviation from eating, have you had a fecal done to rule out parasites?

Your temps are way too high. 85 max on the warm side, 75 on the cool side.

Having temps that are too high can cause refusal problems just like temps that are too low.