Get axis not working with inputs

At the moment I'm following the tutorial by unity:

http://unity3d.com/earn/tutorials/projects/space-shooter/moving-the-player

The issue I'm having is that I can't get the vehicle to move. Is there anything stupid that i'm doing wrong. My code is the exact same and i've reset the input manager but still nada.

using UnityEngine; using System.Collections;

[System.Serializable] public class Boundary { public float xMin, xMax, zMin, zMax; } public class PlayerController : MonoBehaviour

{ public float speed; public float tilt; public Boundary boundary;

 void Fixedupdate ()
 {
     float moveHorizontal = Input.GetAxis ("Horizontal");
     float moveVertical = Input.GetAxis ("Vertical");

     Vector3 movement = new Vector3 (moveHorizontal, 0.0f, moveVertical);
     rigidbody.velocity = movement * speed;

     rigidbody.position = new Vector3
     (
         Mathf.Clamp (rigidbody.position.x, boundary.xMin, boundary.xMax),
         0.0f, 
         Mathf.Clamp (rigidbody.position.z, boundary.zMin, boundary.zMax)

     );

     rigidbody.rotation = Quaternion.Euler (0.0f, 0.0f, rigidbody.velocity.x * -tilt); 
 }

}