However, it's not the *only* possibility. A no-start condition can have many causes, including:
* Dead battery: The most common cause.
* Bad starter: The motor that cranks the engine.
* Alternator: Doesn't recharge the battery.
* Faulty ignition switch: Controls power to the starter.
* Low fuel: Seems obvious, but worth checking!
* Fuse or relay problems: Could interrupt power to the starter or ignition system.
* Security system issues: If equipped, an immobilizer could be preventing starting.
* Problems with the PCM (Powertrain Control Module): The car's computer.
While the neutral safety switch is a *possible* culprit, it's best to systematically check the simpler possibilities (battery, fuel) first before focusing on more complex components. A mechanic can diagnose the problem accurately.