my power steering isnt working, dont know what to do =/

i dont really know what kind of information you guys would need for this subject, but i have a 5.0 89 mustang converted to mass air. and its my little project for right now. but i drove the car around the block and its harder than hell to turn the thing. i have the pump hooked up and the lines hooked up i even have power steering fluid in it. what should i do to fix it?
 
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IF theres a loud screeching noise it could be the belt

My friend thought he was going to need a whole new pump but it ended up his belt was too loose and was slipping at the power steering pulley. he got a smaller belt and it was perfect.