MSI b350m gaming pro CPU led light problem

A few days ago, i bought new msi b350m gaming pro motherboard and ryzen 5 1600 cpu. Install all components and check all cable is plugged.

Power is on everything looks fine, fan is spinning, graphics card so working .But the CPU debug light is on, no display, it cannot get into BIOS.

So I sent it back to the store (only motherboard, CPU and ram),then ask them to check what's the problem. But everything works fine, it can boot into BIOS.

I was wondering if the problem is PSU?

I read a lot of forums and they got similar problem said that maybe the BIOS version cause the mobo and CPU can't boot up. If it's true, how do I update the motherboard BIOS version without booting up the system? I can't even get into BIOS .

My specs:

Mobo:MSI b350m gaming pro
Cpu:AMD ryzen 5 1600
Ram:G.SKILL DDR4 Aegis Gaming Series F4-3000C16S-8GISB DDR4 3000MHz 8GB (1x8GB) Ram
Gpu:Asus Gtx 1070 founder edition
Hdd:Toshiba 1tb harddisk
Psu:Cooler Master v550 80 plus gold

Sorry for my bad english .
Reply to Imgoshlok
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More about msi b350m gaming pro cpu led light problem
  1. It sounds like they at least have capability to do basic bench testing. I'd take it back to the store and ask them to install the latest BIOS.

    It might help to take the update BIOS on a flash drive to help them out so the don't have to search for it but even that should be optional. In my opinion, any store with the capability should update to the latest release BIOS before selling it to you anyway. This is especially true for newly released CPU architectures where (sometimes make-it-work) changes come fast and frequent.
    Reply to drea.drechsler
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