Help With PC turning on and off over and over.....

[JD52191]

Hello this is my first post anywhere, so apologies for any errors. The problem i have is as follows, today i replaced some fans or may i say all the fans in my pc, and installed noctua fans , 2 for my coarsair h100i, and 4 for case ventilation, also got the nzxt rgb hue, and some individually sleeved cables. when i finished and hit the power button my pc turns on then off and does this continuously, however when i unplug the 8 pin power connector from MBO the pc turns on but there's no video signal, any suggestions would be appreciated. My setup is as follows:

MBO: ASUS MAXIMUS VI HERO

CPU: INTEL I5 4670K

CPU COOLER: COARSAIR H100I

RAM: COARSAIR VENGEANCE LP (2x4gb)

PSU: COARSAIR CX750M

GPU: EVGA GTX 770 SC 2GB

SSD: SAMSUNG EVO 820 1T

OS: WINDOWS 8.1 

 FANS: NOCTUA NF-S12A x4

            NOCTUA  NF-F12 x2

[Darkstar101]

Have you sleeved the cables yourself? Can be pins in wrong places.

[jnmbhj]

You may have a defective PSU. I suggest trying the power supply in a different unit if that doesn't work then RMA it. 

[JD52191]

Have you sleeved the cables yourself? Can be pins in wrong places.

No i bought them, but i removed them and used the stock cables, but it does the same thing.

[JD52191]

You may have a defective PSU. I suggest trying the power supply in a different unit if that doesn't work then RMA it. 

i hope that i don't just had it replaced once, like in June or July, built my pc this march.

[JD52191]

So this morning i uninstall everything and connected on thing at a time, and my pc is up and running now, might have been that the psu was not receiving enough air but now that i put it back in its usual place its working fine, so thanks to any and all who tried to help......