CPU/MOBO doesn't detects any GPU

[qounik]

I had a perfectly running PC. Then a while back I bought a new casing for it. I swapped all components from my old case to new one myself and afterwards when I turned on my PC, there was no output through the Nvidia GPU.
After some minor troubleshooting I disconnected the whole GPU and started the PC up with the internal Intel graphics driver. The monitor now has output and everything else is running fine as of now, except for the GPU.
Retried again for any change in results, no luck. Checked all driver settings, the BIOS display output preferences, still all same. So I tried a different GPU from another PC, and still the external GPU didn't show up. I tried my GPU and POWER SUPPLY on another PC and it worked on that PC.
Basically after some research and consultation, I came to the conclusion that motherboard might be the issue. Then I got a motherboard to prove my theory, but there's no output through these new motherboard as well. This is the current situation.
What could be the underlying cause of the problem? Can it be the processor somehow? Why the problem would arise suddenly? Any help will be appreciated.

CPU: i7 6700
GPU: GTX 1050 Ti OC
DxDiagME.txt

[WereCatf]

3 minutes ago, qounik said:

What could be the underlying cause of the problem?

You might have broken the PCI-E - port on the mobo, or there might be a short somewhere. Take the mobo and everything out of the case, put it on a desk and fire it up and see if the GPU works then -- if it does, you're shorting something inside the case.

[qounik]

So I just took everything out and try to boot but there was no display output at all. Not with GPU Or integrated GPU. CPU fan spins, Power supply fan spins even GPU Fans spins for few seconds on boot but no output 

[qounik]

Looks anything abnormal?

[qounik]

Did a CMOS Reset and Successful Got in with iGPU