OK, still not alot of info, but my first guess is that the temps are too low. I know you are going to say they are not and that is exactly what I used to say until I bought a mximum/minimum thermometer.
At night the temps drop a good deal and you won't know it. At a minimum, the first thing is to get an under the tank thermometer and set it up, provide a good hide box (small mac and cheese boxes work great).
Beyond that, go to any major search engine and search proper husbandry for corn snakes. In the majority of cases though, temps are the catalyst to many feeding/non feeding issues.
dc
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