Car makes a winding whenever I turn left or right...whats wrong with my car?

I have a 99 Chevy Lumina with 140,000 miles on it. I started my car one day, and it was making a winding noise when I turned the wheels left or right, and when accelerating. I recently got a new belt and tensioner and It was fine after the repair, but now the noise is back, and my car seems to have no power steering. What could my problem be?
 
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