New PC build - Screen black on start up

When I power on the PC GPU fans spin I see Motherboard Logo, after a few seconds the screen goes black & monitor gives the no signal message on the screen.

Back Story:

Upgrades the Motherboard, CPU & Ram, Used previous PSU & GPU.  (However the PSU was used in another computer, so I have never used this PSU with this GPU - previous PSU was 360w, PSU worked fine in the second computer for a GTX 560Ti - the only difference being it used 2 x 6 pins where 970 used 6 pin and 8 pin, which I'm supplying a 6 pin and a 6+2 pin to GPU) 

Had problems with installing windows (due to USBs not working past BIOS, when I got to windows install screen no USBs work 2.0 or 3.0 - Could not find option in BIOS to enable Legacy drivers) on this computer so I used another computer to final windows on my SSD (then swapped it ower to current computer - specs below) Once SSD was installed, Windows 7 loaded up fine, used windows 10 upgrade tool, after restarting this problem occurred. I did not verify when running on Windows 7 if GPU fans were spinning (the DVI was plugged into the GPU DVI) & did not install video drivers before reformatting to Windows 10. I selected wipe the SSD as I did not want any problems since I had installed the OS on another system with different components. So it should have been a fresh install of Windows 10.

-I've tried to start the computer with the DVI plugged into motherboard DVI and no signal at all.

-I've tried to boot in safe mode with no success.

Specs:

Motherboard: ASRock AB350M Pro4

GPU: Asus GTX970

CPU: Ryzen 7 1700X

Ram: G.Skill 8gx2 2666Mhz

OS: Windows 10

HD: 260gb SSD

PSU: 750w

Link:

I ran the installer once windows 7 was booted up on the new build computer.

I'm currently at work so I can't try the fix at this time, but I will report back when I am able to (Thursday morning)

Thank you for your reply,

Steven

Let us know how resetting to defaults goes for you.