It would be easier to just RMA the card.
If you ramp the fan slider in Afterburner all the way to 100% do they all spin? If no, then RMA the card.
Any other fan controller software installed? If no, then RMA the card.
There is another option to remove the cooler off the card and make sure the fan power connectors are secured, but I think it'll be easier to just RMA the card.
Unless, you already know how to do that... there are videos that show you how, but it's at your own risk. I think you should just RMA the card if the answers to the first 2 questions are 'no'.