My friend just bought a new CPU, Motherboard and RAM.
When we bench tested the system, by shorting the power pins on the front panel header, we found out it goes into an infinite restart loop, It powers on for about one second and then it shuts down again. There was no video output.
We have already tried working ram modules. in all the available slots. Also we tried using another working PSU. (Corsair TX 750W) We plugged in the CPU fan just to be sure and tried clearing CMOS.
List of components: Intel Core i5 4670K Gigabyte GA-Z87-HD3 Crucial Ballistix Tactical BLT2C4G3D1608ET3LX0CEU Corsair Gs 800
We checked the socket and it looks fine, then we reinstalled the cpu and cooler. It did the exact same thing. We're sending the Motherboard back, i hope it will work with the next one.