PC won't display

Sep 6, 2018
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So I just got all my PC parts and I put it all together like the Video and I come to find that he has a (HDMI) cord that comes from the power box I do not have one of those on my Power Box my power box is a (TR2 500w Series 2) everything boots up and lights up but it won't display I don't know if I need that cord or not please help