<human>:  What should I do if my car won't start?
<bot>: If your car won't start, the first thing you should do is to check the battery connections to make sure they are secure and free of corrosion. If they appear secure and clean, you can check the spark plugs to make sure they are working properly. If they seem to be in good condition, you can also check the fuel system to make sure there is sufficient pressure and the engine is getting enough fuel. Finally, if all of these tests fail, you may need to take the car to a mechanic for further diagnosis and repairs.