My starting motor was struggling to start the car. I knew it was the starter as there was a new battery in it. Finally the car wouldn't start and I decided to fit a new starter, when I turned the key the first time, it wouldn't start. Turned it again and it did. Starts all the time now. The problem I have now is, when I take the key out and open the door the buzzer sounds as though the key is still in and the door won't lock. Any ideas please. Thanks in advance.