Its not the belt, that would cause belt noise not a PS whine.
Fords are notoriously noisey anyways. If you turned the wheel while the vehicle was not running you drew air into the system (common Ford thing) and it will have to bleed itself out. Otherwise its in the pump or there may be a screen in the resevoir that is plugged.
"In the essentials: unity; in the non-essentials: liberty; in all things: love" - often incorrectly attributed to Augustine or John Wesley - original source in question
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