Msi b350 gaming plus dead?

Sep 12, 2018
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Hello together,

Yesterday my new pc parts arrived so i plugged in everything, updated the bios, installed a new windows copy etc. And everything went fine I even played some games and ran some benchmarks and I had to reset 3 times so it worked proberly.
Today I wanted to start the computer and it made some kind of noise, one of my led fans brightened up and then shut down but kept spinning. the pc startet but the screen kept black.
When I took a look inside I saw that the ez debug CPU led was on but it never went of.
So I startet to check what it could be.
So I changed the ram slot, checked the cpu pins, unplugged everything except cpu and all other combinations too, I tried to reset the cmos and I used another pu.
I literally tried everything I could think of and find on the internet except of 2 things: change the MB and change the cpu.
Now here's the thing why I think it's the MB. Every fan was connected to the MB and one of the fans led was killed at the first start today.
Furthermore the MB wont react to the power and reset button once its running, I don't get any post sounds and neither the keyboard nor the mouse will light up, not even for a second.

So, am I right with the assumption that it's the Mainboard or could it be the cpu, like the MB ez debug led is showing?

New Parts:
Motherboard : MSI B350 gaming plus
Cpu: AMD ryzen 1600x
Ram: G-skill aegis 8gb 3000
Power supply: Xilence XP 700

Old parts:
Ssd: Samsung Evo 850
Hdd: wd - wd20ears
CPU fan: alpenföhn brocken 2