In case the starter motor does not engage with the effect of the switch being operated, make sure that the lever to the automatic mode Neutral or Park, or to the manual mode Neutral and the clutch pedal is fully released. Check that the battery is charged, and that all cables to battery and starter solenoid terminals are neatly untangled. When the starter motor fails to start and the solenoid instead clicks with the battery fully charged, the problem could be in the main solenoid contacts, or the starter motor itself. When no sound can be heard when the solenoid plunger is actuated the solenoid could have a fault or the solenoid circuit might be open.