Computer turns on for 15 seconds

svt20

Honorable
Jul 31, 2013
9
0
10,510
Specs:

Cpu: i5 4670k
Motherboard: Gigabyte GA-Z87X-UD4H
Video cards: Two MSI GTX 760s
Cooler Noctua: NH-D14
PSU: Corsair HX 750
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB)

Hi everyone. I just built my pc and I'm having trouble getting it to work. I press the power button, it runs for 15 seconds, then turns off, turns back on, and keeps repeating this until I turn off the PSU. I really need some help with this, thank you.
 

svt20

Honorable
Jul 31, 2013
9
0
10,510
When I press the PSU switch, a yellow light is visible from the motherboard. When I press the switch to turn on the PC, a red light appears from the motherboard as well.