My Fan Is Going On But No Display What Can Be Wrong With My Card Gv-r675oc-1gi

1. Try putting the GPU in another PCIe slot.
2. Try the new GPU in another computer (freind/family).
3. Try a different GPU if available (friend/family) in your new computer.
4. Return/exchange new GPU.

I wish you could have provided with more information with details or specifications. Nevertheless, just assuming that you have R9 380 4GB card just to make you understand. First you could try by connecting it with more powerful power supply unit just if not in your case, reason being, prior you would be using only on windows without any graphic driver installed but once you install it, your GPU drenches all of the power from supply, thus, increasing its power demand.

Now, as per your statement, you have all the components brand new, you should check for Pci-e based card installed in your system before connecting graphic card. Just connect that monitor cable to monitor and enter the BIOS of your motherboard. Now set the interface mode to Pci-e or peg mode and save all the new settings. Switch graphic cable from motherboard to video points of new graphic card.
Once you restart the computer you won't be facing the same problem and you would be getting the response from new graphic card.
One more point to add on is to make sure all pins of the 12v Eatx are connected to the motherboard.
So, crux is just check everything just be sufficient enough and most importantly the power supply to run the graphic card fine.

Thanks