[richtazz]

I would look at the check valve in the power steering pump where the pressure line comes into it. Sounds like the check valve is sticking and causing the pump to run itself dry, causing it to be noisy, and when you turn, the increase in pressure works past the sticky valve and quiets it down. If there are no metallic particles in the fluid, I would just replace the check valve. If the fluid is full of metal particles, the pump has started to self destruct and you need to flush the system and replace the pump.