Can anyone help my car isn't starting at the moment. When you turn the key the lights come on and electrics work but the starter motor doesn't do anything (no noise at all). The engine won't turn or anything. The only way to start the car is by bump starting it this works fine and the car runs perfectly however if you turn the car off it won't start unless you bump it again. I've changed the battery and the alternator is working fine. Any help would be great.