Noise From the Front

#1
I have 2008 corolla S .When I start driving or parking, afterslightly turning the steering wheel, I always heard grinding sound.I went to toyota dealer and they said from the power steering system and fixed it but the noise is still there.I went to other mechanic and check the break system it was Ok.The noise did happen in front of them.Could some one tell me what the noise can be coming from?There was no noise when driving only at parking or start moving.
 
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