nothing happens to computer

I recently bought this sapphire rx 470 4gb. It had a broken fan so i got it for a very low price, however even after fixing the fan graphics card won't work. When i install it in the computer the whole system don't power on, the fans dont spin nor the lights come on. When i open the gpu to...

So I've updated my BIOS. It was fine while updating but the problem is that when it needed to restart it did, but after restarting it was full black screen, no LED light on the case were showing up, keyboard and mouse don't seem to work too. I can boot into windows. My specs (if needed) are...