A while back when I needed to replace a broken N64 controller, here's what I did... I went and bought a new one from a store with a good return policy. Then I took out the new controller and replaced it with the old controller that wasn't working and returned it to the store the next day. Free controller replacement.Originally Posted by Shom
Granted, the N64 controllers came in cardboard boxes so it was much easier to return. You'll have to check with the store to see if they'll let you return stuff that "isn't working" that's already been cut out of the plastic.
Call up Nintendo customer support. They'll walk you through a couple quick tests and if it does appear to be defective, most likely they will replace it at no charge.