2015 GMC Yukon - Shuts off then stays dead

when I switch off the car the entire car shuts off like its dead battery it wont start nothing works there is no power. Had it checked but the battery is good, computer is good I don’t know why it shuts off when I switch off the car.

What do you do to get it started ?

I mean you must be able to start it, otherwise you wouldn’t be shutting it off.

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