1999 Chevy Cavalier will not satrt?Turn over? Power is good

Hi, if your saying the starter won't crank. I'd have to check the starter circuit. Make sure the battery has a full charge and the connections are good. Did you try cranking in neutral? The starter solenoid S terminal, purple wire, should be hot with the key in the crank position. If it isn't hot, backtrack the circuit. Some of the national brand autostores will check the starter for you, if you take it off and take it to them.