Car wont start from time to time more wont than will

Turn ignishion on dash lights come up turn to start nothink I checked battery and leads good changed starter wasnt that changed inhibitor switch not that checked fuses nothink thay all seem good, I was normaly trying to start then turn off and wate but I tryed not wateing as long turning and turning one after another quickly and it fired but its still playing up my partner said once she herd that noise your car makes when you try starting while car is running but she wasnt turning the key? So ive been thinking is it my ignishion? Need some advice !