Hello,
Yes the high side hose can definitely cause this problem. What happens is the inside of the hose comes apart which can sometime stop the flow of the fluid, I would start there and see what happens.
To see if the pump works start the car and using a pare of needle nose plies slowly cut off the pressure hose and should be able to feel hydraulic pressure under the pliers if the pump is good.
Here is a video showing how to replace the power steering pressure hose.
https://youtu.be/BGBUv5r9fk0
Please let us know what happens.
Best, Ken
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Friday, March 24th, 2017 AT 8:52 PM