DaVinci Resolve 15 doesn't start with GTX 970

Hello,
Today I added a graphic card (GTX 970) to my computer. Hoped it would be good for some video edting, but unfortunately, the Resolve 15 doesn't even start - when I click on the icon, it just does nothing.
Please help
Today I added a graphic card (GTX 970) to my computer. Hoped it would be good for some video edting, but unfortunately, the Resolve 15 doesn't even start - when I click on the icon, it just does nothing.
Please help