Look at this first:
You see that 4pin connector in the image is that plugged in or pci-e express cable split and plugged in to the wrong socket ?
Also, remove the video card, and start out with your keyboard.
Hit the power button and note if the keyboard flickers and shows a bios post screen on the monitor.
If that is fine, put the graphics card back in plug in the pc-e cable to the card.
Make sure nothing is pressing down too hard on the mobo itself.
That is a usual cause for the computer not to bootup correctly.