You may want to offer a different type of prey item. I wont say anything about your husbandry as that is usually the first thing that should be checked, but if you feel the husbandry is up to par it may be that the snake is not attracted to the type of food which is being offered. My albino female refused rats for a good three months but struck the first mouse I offered her within seconds. If this turns out to be the case you can attempt to switch him with scenting or just feed what he prefers.