If you are experiencing a situation where your car's engine is refusing to start, there could be several potential causes. Here are a few things you can check before seeking professional assistance:

1. Verify that your car is in park or neutral: If your car has an automatic transmission, make sure it is in the "P" (Park) or "N" (Neutral) position. The engine won't start if it's in any other gear. If you have a manual transmission, make sure the clutch is fully engaged.

2. Check the battery: A dead or depleted battery can prevent the engine from starting. Look for signs of a weak battery such as dim headlights or a sluggish starter motor. If this is the case, you can try jump-starting your car using jumper cables and a working vehicle's battery. If the engine starts after jump-starting, the battery may need to be charged or replaced.

3. Inspect the fuel level: Ensure that your car has enough fuel to operate. It's possible that the fuel gauge is not accurately measuring the amount of fuel in the tank.

4. Check the ignition switch: The ignition switch may be faulty, preventing electrical power from reaching the starter motor. Turn the key to the "START" position and listen for any clicking sounds. If you hear a clicking noise but the engine doesn't start, it could indicate an issue with the starter motor or ignition switch.

5. Examine the spark plugs: Over time, spark plugs can become fouled or worn out, resulting in difficulty starting the engine. If you have the necessary tools and knowledge, you can check the spark plugs for any signs of damage or buildup and replace them if necessary.

6. Inspect the starter motor: The starter motor is responsible for turning the engine over when you start the car. A faulty starter motor can prevent the engine from starting altogether. Listen for any grinding or whining noises when turning the key, as this could indicate an issue with the starter motor.

It's important to note that these are just some common troubleshooting steps for a non-starting engine. If you are uncertain or uncomfortable performing any of these tasks, it's recommended to consult a professional mechanic for further diagnosis and repair.