Computer doesn't boot. RGB RAM doesn't glow. GPU fans start but immediately stop.

Oct 11, 2018
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My specs:
* Motherboard: Asus tuf b350m-plus gaming
* RAM: G.SKILL F4-3000C16D-16GTZR TRIDENT Z RGB
* CPU: AMD Ryzen 7 2700X SAM4
* PSU: Deepcool Quanta DQ550ST 550W

All brand new.

When I try to boot PC, there are no beeps and no image on the monitor. RAM doesn't glow. CPU fan is working, though.

If I connect a GPU (GTX 1050 Ti), its fans start working, but stop almost immediately.

Thanks in advance!

UPDATE: One solo RAM stick works. But BIOS still won't boot.