Hello JTraynor77,
I think replacing the motherboard will be the only way to discard if the processor is or not defective.
I don’t think the issue is related to the power supply since it is an 850 Watts power supply, so it is more than enough.
Once you received the replacement motherboard, please test it out of the chassis, with minimum configuration.
Do not update the BIOS if it is not necessary, because the issue could be related to a chance on a previous BIOS updated,
Regards.