If it won't turn left at all, and it did before you changed the cable, about the only thing that would do that is something physically in the way of the shaft or tierods/suspension, etc...
Have you looked underneath to see if everything is where it should be and not hitting anything that moves on the suspension/steering? Check the lines to make sure you've not pinched them etc when you jacked it up?? If it's just stiff turing left, check the lines as said to make sure nothings broke/pinched etc...