Hey guys I did a build yesterday (my first) and when I switched on the PC. It turned on for a few seconds, fans started spinning, then it showed a green flash on the oc button on mobo, made a clicking sound and turned off and kept on repeating the same on itself. Is it because I do not have a video card installed? My specs are- Intel i5 6600k, Gigabyte GA Z170X Gaming 5, Corasir CSM 750 Watt, WD 1 TB Blue, Samsung 850 Evo 120 GB. I was going to attach a video card later.