HELP!!! Power steering issues... continued

[68454RS]

'68 Camaro, Concept One serpentine system. Took the car for an 80 mile run last week and everything was great. Next morning, no power steering. Sent the pump back to Concept One and they said it wasn't holding pressure so sent me a new one. (great customer service)

Got the new pump today, installed it, filled with fluid, fired up the car and still no power steering
Pulled return line, fired it up and good fast flow.. reconnect, fill with fluid and again, no PS. Each time, I turned the wheel lock to lock several times trying to bleed the system of air.

Could it be the gear box? What and how do they act when something goes bad in them? I'm so freakin not happy right now