Where are you feeding it? In the cage, in a deli cup, in a bag?
Are you trying to feed it live or prekilled?
How long have you had it? How long has it been since it ate last?
Other than all of that information that would be extremely helpful... Try lizard scenting, or try an anole.
:I just got a hatchling gray banded king and have been unable to get it to eat.I have had boas and corns in the past but this is my first king.I offered a 2 day old pinkie with no response.I read on another site to wash it and dry it .So I tried that.Any suggestions would be very much appreciated.