So I have been up sine 10 last night putting this together, I might be a little tired. I put everything together, connected all the power cables (except one who could be the culprit, I just had no idea where it might go. Might just be a different kind of power supply.) When I press power everything lights up, cpu fan, graphics card pci is green lit, I hear the MB beep. Yet I see nothing on the monitor. It's not the monitor or hdmi cable, I checked. Please help.