I have built 3 PCs in the last month. The first one I built and booted up with no problem and has windows installed. Then I built a second one that would not show signal but I thought the graphics card was bad. Then I built a 3rd one and still no signal and into a boot loops and all the components are new. I then tested the PC that previously worked and it is also not booting anymore. I have changes the power cables, dvi cables, and HDMI, and still no boots.