I see that CPU has onboard graphics so I'd pull the GPU for now and use DDU (see google) to remove all Nvidia drivers. Now that it is working be sure to have plenty of free space on your Windows drive then run CHKDSK /F /R and maybe /X if you time. After the chkdsk and all working power down and try the GPU again. The 970 isn't that old but yes they can fail.
I'm at wit's end. I was playing a game a few weeks ago and my power supply blew. Ordered a new one, installed it, and when I booted my PC up it got to the windows loading screen before the little circle froze briefly and the screen went black. The monitor is still receiving a signal, but it's blank.
Nvidia GeForce 970
Asus z-97a motherboard
Intel i7 4790k (I think)
I've uninstalled GPU drivers and set bios to recommended factory settings. I can't roll back to a windows restore point (none available) and can't even get into safe mode. The same problem happens.
The only way I can access windows is by removing my GPU and using the on board graphics.
With the gpu plugged in I've tried switching to integrated graphics after the screen goes black but have no signal.
Is my GPU fubar? It loads the bios screen just fine.