I changed my power steering pump, flushed the old fluid out and it worked great for about 2 hours. On a turn my steering got completely hard with no whining or any noise and still currently like that. HELPP!!

2004 Dodge Ram 1500 4x4 5.7

 

Check the fluid level, and see if it is actually pumping fluid. I got two bad pumps from my local parts store, when I was working on my daughters car.......

 

You could also have air in the rack