Desktop boot loop

[Airy-0]

PC would turn on and off with all the lights and fans turning on and off with cycles lasting ~5 seconds.

Have tried resetting the cmos, reseating/changing the ram, taking off components and checked temp/performance. 

 

At first it would turn on after several tries(had a pattern where the pc turns on and goes to splash screen followed by the dash on the top left corner but with a reduced resolution, turns off and then next boot sequence would be complete and into windows), with no problems that I can detect (hdd, cpu, gpu, temp, performance etc). Recently, after not using the computer for about a week, it would get stuck in a seemingly endless loop. Sometimes the mobo light would not turn on, and therefore have a faster on/off speed. PSU fan wouldn't turn off during these loops while all other parts do. 

 

The psu is 630 watt and there's no way that it's not enough, everything is connected properly and functions properly if it boots successfully.

The motherboard is gigabyte z97 gaming 5 and cpu is 4790k. 

Where do you guys think the problem lies? 

 

 

[Neutrideo]

I feel that you have a corrupt install of windows, try fresh instal??