What could the problem be that is not turning on. on 2001 Buick LeSabre

My 2001 LeSabre is dead. changed battery. changed starter. completely dead. Not cranking just dead

Asked by for the 2001 Buick LeSabre
i have a 02 buick century,the source to my problem was a wire broke in my ignition switch.had to replace it.go to local daler and price ne for your car model and check for they smart chip in the key
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What does the battery voltage read? It should at rest read 12.6 volts if the battery is fully charged. A battery may read 12.6 volts but not with stand a load test. Are the head lights bright when you turn on the headlights? Turn on the head lights and try to start the car the lights should dim if the starter is drawing current.. On cranking the ignition switch sends power to the starter so the small diameter wire at the starter should have power only when cranking.