I finished building my system last night and wanted to boot into the bios to make sure everything looked good only to realize the computer would power on but then my mouse/keyboard/monitor would get no signal (yet all the fans were running). The computer would power on and then restart itself and then continue doing that until I hold down the power to shut it down.
I unplugged everything (cpu fans, cooler fan, gpu), reseated the ATX connectors (24-pin and 8-pin) but still no luck. I tried different positions for the RAM and then when I tried booting with 1 stick of RAM I was able to boot into the bios (FYI I tested both sticks of RAM individually and they both allow me to get into the bios).
I tried resetting the CMOS, tried different slots for the RAM and also enabling XMP for my memory via the bios, no luck. The system still won't boot with 2 sticks of ram.
Am I missing anything or should I just rma the motherboard?
Motherboard: GIGABYTE Z370P D3
RAM: G.SKILL Ripjaws V Series 16GB DDR4 3000
PSU: EVGA SuperNOVA 650 G3, 80 Plus Gold 650W
CPU: i7-8700