Your vehicle is..
off
does not have electrically assisted steering
is broken
If it was easy and now it is hard, you may have thrown a power steering belt. You may need power steering fluid. You may have an obstruction on your front wheels. You may have a flat front tire.
The steering wheel will be really hard to turn.
Assuming you mean the steering column, it is what transmits the turning of the wheel in your hands to the steering mechanism which moves the wheels that are touching the ground.
The steering gear has failed.
it depends on what you mean by not to turn. side to side or move forward backwards.(stall) if you driving and when you turn the steering wheel the vehicle stops moving then the problem may be your cv axles some how disconecting from the transaxle. if you mean you turn the steering wheel and the wheels don't do anything then your rack and pinion is bad,or your steering column or u joints are loose/disconected. also check where the column and rack interlock sometimes that screw strips and the steering wheel turns but it would not transfer the motion to the rack. how does the steering wheel feels. same,loose,keeps turning endlessly?
4 w s mean four wheel steering meaning the back wheels also turn to steer
There is no light on the steering wheel.
sounds like a bad power stearing pump
Power steering or wheel bearing?
most likely, power steering pump low on fluid or on its way out,i think.
the car may be low on power steering fluid
In most cases cars today have power steering. When this is not working properly, the car is hard to turn. The two most common reasons is a loose, slipping, or broken belt, or, the system is low on fluid.