why is my steering so hard stiff after a change of power steering pump? on 2007 Toyota Camry

My problem actually started when i asked that a leaky hose be changed on the power steering pump.After d change,came a whinning noise and a rubbery steering stiffness,after the change:From cold start,it is slightly soft.After about 10mins of driving,it become very hard stiff!I have also changed all pressure hoses.

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1 answer
POSS BAD RACK AND PINION AND MISDIAG FROM THE START