Battery changed four months ago at shop. Car has power but still won't start. When you turn the key you get nothing.
Answer: First be sure to check ALL fuses in all fuse blocks. There is also a crank relay that may be bad.
Assuming the battery is good, You need to check for power at the purple wire on the starter as someone tries to crank the engine, If it has power, then the starter is bad. If no power, then you can have a neutral safety switch problem, or look at the dash to see if there is a security or theft light on. If so, you have a problem in the theft system.