I ordered and installed:
AMD R5 2600X
ASRock Fatal1ty B450 Gaming K4
Corsair Vengeance DDR4 LPX 3000Mhz 2x8Go
It's in my old system, so I power it with my FSP Raider 750W, and I plugged my old R9 280X on it.
At this point, when I power on, nothing happens, I mean fans spin, keyboard...