2000 Chevy Cavalier no power

I would suspect a faulty ignition switch. If you can access the connector at the ignition switch make sure you have power on all red wires, if not then check for open fuses under hood or get back to me and we can track the wiring, if you have power at the red wires then check for power on the rest of them with the key on and all should have power except the yellow wire.