No power steering

I have a 1990 Turbo Supra. I am having problems with power steering. The car sat for 2 weeks, was running fine prior to that, got in to drive and and it felt like there was no power steering. Replaced pump (drained and new fluid and cleaned tank and filter) .NO CHANGE, had rack rebuilt and new high pressure hose. NO CHANGE. Now I am going to start looking at the progressive power steering. Have not checked pump pressure. Nothing so far is working ….anybody have an ideas or suggestion!!!!!