Sounds like one of the psu protections is being triggered.

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This info will really help other Forum Members to help you.
 
Computer Case:
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Motherboard:
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Is Bios Current Yes or No.
 
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GPU/Video:
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Monitor:
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Monitor:
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AGE
 
TV If Used:
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PSU:
Make: EVGA
Model: 1300 G2
AGE:
 
Other PCI/PCIe installed Devices:
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Other PCI/PCIe installed Devices:
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mbeh4sh

bcavnaugh
The EVGA 1300 G2 only comes with two CPU cables, what other cables did you test with?
Let's hope you did not use a PCIe GPU Power Cable.
Take your MB out of the Computer Case and test on a table top.
You can only use the Cables that came with your G2 or other EVGA G2/3 P2 or T2 Cables.
Do Not Use any Corsair Cables.

I have only used CPU cables that came with the PSU. Motherboard is an MSI z170A Gaming Pro Carbon.
At the moment I only have connected 24pin to JPWR1 and CPU1 cable to 8pin (JPWR2) on motherboard.
If I remove 8pin it starting as it should. I just have the motherboard and psu on an wooden table.

Sounds like you may have a faulty cable. Converting a 6-pin pci-e to an 8-pin atx will help you narrow things down.

You have two cables? Both cannot be bad?
 

bcavnaugh
You have two cables? Both cannot be bad?
 

24pin is working. Its the 8pin what is causing it not go start.

mbeh4sh
The other brand new PSU cabel did not make any difference that came with package, I tried with another motherboard also. Two new faulty cables sounds crazy. The result is pretty much the same, the only thing that differs is that the fan starts and stops real quick. It looks like a normal start for 1 sec. It's like it needs that little extra power to make it going. On the first motherboard it's only click sound. Disconnecting 8pin on motherboard both starts. 
 
How does service and replacement looks like ? (Norway, near Oslo)
 
Rgs

 
Both motherboards are MSI z170A Gaming Pro Carbon's?

After more digging it might not be the PSU actually. I connected ram, cpu fan, ssd and 24pin and 8pin to motherboard and rig it's starting. So perhaps it's the cpu that's causing it. When I attach the cpu it's not starting that's for sure.
 

Sajin
Running without the cpu in the socket is pretty much the same thing as running withtout the 8-pin connected. Let us know how the new psu works.

Yes, I let you know.
If I try to start with cpu in socket it won't start, when I remove cpu from socket it starts. 8pin connected in both cases.

mbeh4sh
A new CPU solved the issue :)