1. Faulty Ignition Switch: The ignition switch may be defective, preventing power from being sent to the starter solenoid. Try jiggling the key in the ignition or turning it back and forth a few times to see if the engine cranks. If it does, the ignition switch may need to be replaced.
2. Bad Starter Relay: The starter relay is responsible for sending power from the battery to the starter solenoid. If the relay is faulty, it can prevent the starter from engaging. Check the starter relay for any signs of damage or corrosion and replace it if necessary.
3. Faulty Starter Solenoid: The starter solenoid is an electrical switch that engages the starter motor. If the solenoid is defective, it will not allow the starter motor to turn over. Check the solenoid for any signs of damage or corrosion and replace it if necessary.
4. Loose or Corroded Battery Cables: Ensure the battery cables are securely connected to the battery terminals and the starter. Clean any corrosion from the terminals and cable ends and reattach them firmly.
5. Bad Battery: If the battery is weak or dead, it may not have enough power to crank the starter motor. Check the battery voltage and replace it if it's below the recommended level.
If you still have no power under the hood, it is recommended to have the vehicle inspected by a qualified mechanic to determine the exact cause of the problem and perform the necessary repairs.