1. How long ago did you get the snake? You want to give it at least a full week without handling or feeding to let it get settled in. Don't try to feed it until a full week has passed.
2. How did you prepare the f/t mouse and how large was it? (You want to make sure it's fully warmed and appealing to the snake)
3. What are conditions like in the tank? Sometimes snakes won't eat if their husbandry is wrong. I know you were asking a lot of questions on the forum this week - were you able to get things set up properly before you purchased your snake?