No video output

Jul 31, 2018
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Just put together a pc, ryzen5 2600, 16gb Corsair vengeance ram, b350-f motherboard, gtx970 4gb graphics card, 600W evga psu. I put it together everything seems to be powered as all the fans are on but I can’t get a video output, I’ve tried a hdmi on both the motherboard and the graphics card but all I get is a black screen