Engine seized? Weak battery? Loose or corroded battery cables? Bad starter? Bad starter solenoid? Bad neutral safety switch?
There has been a power failure to these lights. Check for loose wiring at the battery, a bad fuseable link, or blown fuse to start the troubleshooting process.
Dead battery?
you drain your battery when you leave your lights on
If it is a continues clicking sound you here it is probably the starter solenoid. This does not mean the solenoid is defective, it means either the battery is low on charge or you have a bad connection from the battery to the starter. Turn the headlights "on" and try to start the engine. If the lights are bright when you are doing this, you probably have a bad connection. If the lights are dim when you turn them "on", check the connections to the battery, if the connections are good, the battery is low on charge. Next, check your battery and charging system.
battery
Dead battery.
When your lights are on and your engine is not running you are taking the power for your car lights directly from your battery. If you leave them on long enough, you will run down your battery and your car will not start. Then you will need a jump.
If the 2000 Cavalier has no lights an will not start, there is an electrical issue. Check the battery, alternator, and the wiring from the battery all the way to the starter to find the problem.
Because power from the battery, which was going to the lights, is being utilised to turn the starter motor. You should really start the car before you turn on your lights to avoid putting unnecessary strain on the battery
Almost any auto battery will start the engine if it is runnging good. But I would buy at least a 500cca battery.
It could be because its running out of battery
the battery is dead