I recently had to remove the power steering pump, belts and harmonic pulley from the crank to facilitate an oil thermostat gasket change. The only power steering line I disconnected was the one to the resovoir to drain the system. Once everything was reinstalled and refilled, I noticed this awful sound when the steering goes full travel right or left. There's also a pulsating noise that increases with RPM no matter where the steering wheel is. Please listen to the video.
2007 X5 4.8 N62 engine.
X5 Power Steering Noise - YouTube