I have a Polaris 500, the 4x4 light is on but the shaft that drives the front tires does not turn and will not engage. I was plowing snow for the second time since I owned it and it quit working. It was about 5 degrees out, so I am not sure if something could have froze up. The machines is less then 2 months old and has 11 miles on it. I tried blocking the rear end of the ground so the rear tires could just spin, the front tires / drive shaft will just not engage. Does anyone have any ideas / suggestions?