What's the reason for no response when turning the ignition key?

[VanManuel]

Here are the possible reasons why the car key ignition has no response: 1. Dead battery: If the headlights work and the horn sounds normally, it indicates there should be some power, even if insufficient - you might still hear a faint sound from the starter motor. 2. Ignition switch issue: The ignition switch is prone to failure - the problem could be whether it's delivering power to the starter motor or starter relay. 3. Anti-theft system: Consider whether it's an anti-theft system issue. 4. Starter motor problem: There are usually warning signs before starter motor failure, such as previous occurrences where it only made clicking sounds without starting, then somehow worked again occasionally.