I had the same problem for awhile, except I was trying to switch mine over from live to f/t. He acted like he was afraid and refused to eat at all for about two and a half weeks. I used warm tap water to thaw the mouse, added a little chicken broth, and offered it to my snake. Wouldn't take it. I left it in the enclosure under the lamp for about an hour, went back and offered again-and bingo! He took it.