So I bought new parts to replace old parts. My old graphics card was a xfx r7 260x and my new one is a evga gtx 760. I didn't know how to uninstall the old amd drivers and also the fact that i was in need of some space so i reinstalled windows 7. After I did, I went to replace the graphics card without downloading the drivers for motherboard. Now my monitor stays black on startup and mouse + keyboard is unresponsive so I can't do anything. Please help me fix this.