New build not posting

Aug 2, 2018
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I just build a new pc and it won't post l
it did one but after that I never post again. Also when I turn it on I can't press the power button to turn it off
My mb is ASRock Fatal1ty AB350 Gaming K4 with ryzen 1800x and G.SKILL Ripjaws V Series 2 4 gig with a gtx 1070.
I really need the help thanks.