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Q:

no crank no start on 2000 Buick LeSabre

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
turn key every thing shuts off headlight are bright and stay on will not crank battery is good all connections are clean
(2) Answers
Starter relay could be at issue, also solenoid and starter itself.

You could have an alarm issue, if equipped.

You could have an ignition switch issue.