Power Steering?

[cowking7]

so I go out to my truck this morning to find my power steering sudenly not working. I can turn my wheel all the way left, but I cant turn it right. the steering wheel just spins until it stops then makes a hissing noise. im guessing something broke and power steering fluid leaked out the right side of the steering box or something, idk I dont have any experience in power steering, so any expertise would be verry helpful thank you.