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Stiff power steering can be the result of low or contaminated power-steering fluid (it may need to be changed or flushed). A loose serpentine belt, a worn out power-steering pump, tie-rod/s or ball-joint/s may be seized, or possibly the rack and pinion may have an internal failure. I listed it in the order that I would check all related items. If you have any questions, findings, or details, please write back. Good luck.
You are possibly low on power steering fluid. Check the reservoir and top it up as needed. You will need to do this again after a short while, as air works its way out of the pipes. Then you should think about why it got low to start with. It is possible the power steering gear has sprung a leak somewhere. A common place for that is the steering rack end seals.
no noise when turning and stiff steering is usually narrowed down to 2 things. a bad power steering pump or bad rack and pinion assembly. the rack and pinion is most of the time leaking fluid when it is bad, but you stated the fluid is good. I suggest to remove the power steering reservoir cap , start the engine and look inside the reservoir. the fluid should be swirling if the pump is working especially when turning the steering wheel. if the fluid isn' t moving then the pump is most likely bad.
Do you hear noises while turning the wheel at low speeds or stationary? If you hear a whining noise check the power steering fluid level. A low fluid level would make a whining noise as well as cause stiff steering. If you hear a squealing noise check the power steering belt tension. A slipping belt would cause stiff steering also. If you hear no abnormal noises check to make sure the power steering belt is there. If all of the above check out ok you may have a bad power steering pump, steering gear or a blockage in a pressure line.
You probably do have partial power steering. Check the power steering fluid level, if it's low fill it with the right kind of fluid. Does it whine like you have the wheel turned all the way? could be the power steering pump needs to be replaced.