MSI b350 gaming pro not booting, no post , black screen

Mar 4, 2018
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I bought the whole system last week, I assembled everything, and I tried booting it up, and it won't boot. The ez led shows cpu and vga, though everytime I try to boot, it changes, sometimes only boot led is lit, other time vga,boot,dram led lit, sometimes only cpu led is lit, and sometimes, nothing lits up. Nothing is on the screen. So far, I tried trying different ram, using only 1 ram, clearing cmos by removing battery, trying different cpu (Ryzen 1400), testing other gpu (RX580) but nothing worked so far. I also tested all parts except mobo, and they're working. so I'm suspecting some sort of mobo problem.

System specs

CPU : Ryzen 7 1700
Mobo : msi b350 gaming pro
psu : Seasonic 620W
gpu : EVGA gtx 1060
ram : samsung 8g
ssd : WD 256gb black ssd\