1997 Dodge Neon steering wheel unturnable

(winter conditions)(DOHC)
Alright heres the problem, I found the power steering fluid level at zero I can't turn the steering wheel anymore and theres a loud noise. When I step on the gas it kinda revs along with me, which sometimes causes it to be quiet but then it starts up again. So I bought a quart of power steering fluid and topped it off to the cold level and started the car and it still makes the same noise. So what id like to know is, could it be the power steering pump thats busted or is it the belt. If youd had this problem before not necessarily with a dodge in general it be really cool to hear your point of view thanks