Will not start, full power

Welcome to 2CarPros.

It could be many things. If, however, the security light isn't staying on or flashing, then chances are the key isn't the issue. Have you tried starting it in neutral?

Since nothing happens when you turn the key (starter doesn't engage) we need to determine if the battery is good first, all connections are clean and tight, and if they are, check to see if power is getting to the starter. I will need you to follow these links. First will be how to load test a battery. Second will deal with cleaning battery terminals, and third is checking the starter.

https://www.2carpros.com/articles/car-battery-load-test

https://www.2carpros.com/articles/everything-goes-dead-when-engine-is-cranked

https://www.2carpros.com/articles/starter-not-working-repair

Additionally, here are a few links to help you when checking the starter:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/how-to-check-wiring

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Also, if there is no power to the starter, you will need to check the starter relay. I attached a picture of its orientation in the power distribution box under the hood. See picture 1

First, switch it with a different relay in the box that has the same part number to see if that makes a difference. If there isn't one, here is a link that shows how to check a relay:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

I realize this sounds like a lot, but most things you can do in a couple minutes.

Do these things and let me know what you find. Also, feel free to ask questions if you need help.

Take care,
Joe