loss of power steering

When ever i come to a complete stop and while I am stopped I wil try to cut the wheel in a direction but i will losse power speeting 90% of the time and makes it extemly hard to turn some times though the steering will kick in. It does fine after i even go less than 1mph how ever at a perfect stop it a pain to turn. Im sort of shure it may have somthing to do with the power steering but i am not 100% sure alot of the books trouble shoots says it may be bad ball joints or tie rods.

???

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