Question PC loads bios for a minute or so, then CPU Debug light flashes and it power cycles.

[knana21]

Here are the build details:
Intel i5 9400f
EVGA Geforce GTX 660
8 GB X 2 Team Elite RAM
500 GB PNY SSD
MSI B365M Pro Motherboard
Corsair 450M Power Supply

I have been troubleshooting a few issues with this new build. I finally got it to boot to bios (without SSD or one of the RAM sticks) this morning, but after a minute or so the CPU Debug Light flashes and the PC shuts down before turning on and repeating the process. Any ideas for troubleshooting? Thanks!

 

[rgd1101]

what the cpu cooler?