We have a 2018 with literally only 115 miles on it. Turned the key to fire it up, and the dash screen lit up as normal.... I Hit the starter and the engine turned a half of turn and then completely died out. All the electrical is completely dead now. The only way I can get the dash screen to light up is to disconnect either battery terminal and touch it back on... then you can see the dash computer cycle through as denoted in the attached video. Once the cycle / reset is complete, nothing happens.

The Battery is 100% charged and I replaced the starter relay in hopes that would solve.... But still nothing. I have 12.7 Volts to the key ignition switch, and also I have good continuity in the switch so I know it's good. If I pull the fuse cap/4 wire plug fitting out of the starter relay, as soon as I reattach it, the dash lights up and cycles through again. I've checked all the fuses and relays... the fan fuse is blown, and as soon as I replace it and turn the key switch, it immediately blows again. The only thing that occurs when I turn the switch (with the blown fan fuse installed)  is a "click" in the metal electrical panel just above the power steering.... Not exactly sure what this panel is (maybe the ecu?) but I have confirmed 12.6v power going into it and 0 coming out at the bottom (where the power steering main power plugs into)

At this point, I have around 5-6 hours in just tear Down, testing and diagnosing... so I bit the bullet and took it to the dealership (just don't have the time to spend trying to resolve). My guess is that it's probably a bad ground connection somewhere or crossed / burned up wire. Will keep this updated as I can hopefully help out anyone else who may run into this issue.