If the car clicks when you turn the key the problem is not enough power is getting from the battery to the starter. It could be a bad battery. Even new batteries sometimes fail. Have the battery load tested. It could be a bad connection between the battery cables and the battery or the other end where the cables connects to the car. Clean both ends of the cables with sandpaper or a wire brush. The cables themselves sometimes go bad due to internal corrosion and need to be replaced. A new pair of cables will cost about $20.