MSI Z270 Gaming Pro with Supernova 1600W

Hi there

I'm trying to build up a rig with MSI Z279 Gaming Pro Cabon with Supernova 1600W PSU.
I connected 24pin PSU, with installed Intel Celeron CPU, a 4 GB ram, I would able to jumpstart and see the light, fan spin with the red led light on mobo indicate CPU not found.
But when I connected 8pin CPU PSU as well, I'm not able to boot the mobo
Am I purchased a faulty mobo or I missed anything? Thanks for help!

-Xin