1991 240sx has no power steering

[shuiyuan]

Hi there, i recently bought a 1991 240sx all stock, and power steering doesn't work at all(yes i used to drove a 240sx without a ps pump feels the same). checked the reservoir has full of fluid power steering pump makes no noise or any sign for struggling.
bought another used pump from a trash pile of a car shop, installed, same thing very silent .
my question is should i try another new pump or maybe the rack is bad?
please help me if you had any experience about this