New build won't power on. anymore

[vegatdm]

Made a new build yesterday. Plugged everything in and it powered on just fine. Didn't have a Windows disk so i just checked everything in BIOS and everything was fine. This morning i go out and get a windows disk. When i get home and press the power button nothing happens. The mb light is on so it has power. It powered on just fine yesterday. Still nothing. I check all the connections, front panel is correct, all connections are fine. Psu button is flipped correctly. What could have happened since yesterday?

 

[Dark Lord of Tech]

Specs?