So I built a new computer a few months ago and bought everything new except my graphics card(GTX 970 strix) because of the prices. When I had built my computer I started installed window and all that when I later had downloaded a game I tried to run it but my computer black screened I was in discord and I could talk to my friends so it seems that my graphics card had crashed. I tried a couple more times and changed things but I remembered that I had a GTX 660 strix lying around so I decided to try that and it worked. Because it worked I just assumed that my old graphics card broke when I took it out of the old computer but I recently bought a new 970 from my friend that definitely works because I tried it in my old computer as well but it was the same problem I have also tried a different pci-e port but still the same things happens so I'm just wondering if it's the motherboard or what.
Processor: AMD Ryzen 7 2700x
Motherboard: ASUS ROG STRIX X470-F GAMING
RAM: Corsair 16GB (2x8GB) DDR4 3000Mhz CL15 Vengeance
PSU: Antec HCG Gold 750W
SSD: Samsung 860 EVO 250GB
HDD: Seagate BarraCuda 2TB 7200rpm 64MB
Processor: AMD Ryzen 7 2700x
Motherboard: ASUS ROG STRIX X470-F GAMING
RAM: Corsair 16GB (2x8GB) DDR4 3000Mhz CL15 Vengeance
PSU: Antec HCG Gold 750W
SSD: Samsung 860 EVO 250GB
HDD: Seagate BarraCuda 2TB 7200rpm 64MB