I have a:
Gigabyte B450M DS3H
Ryzen 2600 (stock)
Corsair vengeance ram 2x4Gb
Asus turbo gtx960 4Gb
EVGA 550GD
The problem is that my GPU isn't outputting any signal to my monitor. the cables are fine and working. the fan on the GPU spins. The light is also white on top of the GPU showing that it is receiving enough power from my PSU. I've tested other GPU's of other brands and the same issue is occurring. I've also tried the 960 in another person's PC and the GPU works fine. I have been able to get my PC to boot by removing the little battery to reset the bios but once the PC booted my mouse and keyboard stopped working.. so please if anyone could help or give any advice that would be great.