Question PC won't boot or even output display

May 19, 2022
Last month I built a new PC with a Gigabyte 3060ti OC, 5600x, NZXT C650, 32gb of Corsair Vengeance LTX and Gigabyte B550 AORUS ELITE AX V2 MOBO.
It worked great until last week when randomly as I was speaking into my mic the computer crashed, giving me a BSOD that mentioned something about watchdog before turning off.
Since then I have not been able to get the PC to boot, even after returning the MOBO in exchange for an ROG Strix B550-e Gaming MOBO. With both the Gigabyte mobo and the ROG mobo I have tried resetting CMOS, bios flashback to various different versions, reseating everything in the PC, using one stick of RAM, and turning on and off a couple times.
The GPU works in my other computer, but trying to boot with the ROG STRIX it gives me the Q-Code 45, and a constant white VGA LED.
I'm not sure what else to try and I'm wondering if I should just return the CPU and get a new one?
I'm desperate to get this PC to work and I'm clueless as to why it stopped working suddenly.