Bmm had some good suggestions. Just to add to that list, if you've tried those suggestions and they haven't worked, offer an anole (same kind of animal you used to scent the pinkie). Some corns prefer to have these lizards as their first meals. You can also cut the head off of a frozen pinkie and offer just the head, thawed.
The other thing is to give the snake a couple days off between feeding attempts. If you try it every day the hatchling could get stressed out.
The Cornsnake Manual by Bill and Kathy Love is a great resource for corns, and has tips about feeding reluctant hatchlings. If you can't get it in local pet shops, you can buy it online at
CornUtopia.com or
Amazon.com .
Good luck with your new snake!