I was in the mountains recently and my car.

I was in the mountains recently and my car started making a groan/whine which I found out was the power steering system. I intended replaced the inlet o ring last night as that was a commonly know issue with the groan/whine. When I spoke to my wife she said that the power steering was now completely gone so I made haste to get the car and replace the o ring. After that not working I upped the anti and replaced the pump. I noticed that the old pump when removed was very loud when the shaft was spun manually after removal so I traded the core in and made the repair. I replaced the steering fluid and proceeded to attempt removing the air from the system and the system was now quite. When I tried to drive the car there was still no power steering. I noticed in another article you mentioned flow in the reservoir I do not see that currently. I was wondering if I should replace that as well or am I barking up the wrong tree.