I just built a pc on sunday all parts in the right places and I tried turning it on today nothing. No sounds or anything. I tested the PSU and it is working but when I plug the 24 pin into the motherboard nothing happens at all. The motherboard is a Gigabyte 97A-DS3P. Could it be the motherboard? Or is there the possibility that it's another part? This is my first build. How can I test parts to be sure?