Noob inbound
Got my first GPU upgrade (R9 280X) and just installed it. Thing is, I dont have enough pins (Is that what theyre called?) to fill them all in. Heres what its currently like

Excuse the messy wiring, I'm fixing it later.
So where can I buy something that fills in the 3x2 pin(?) slot? When I turn it on like this, theres no output to the screen, but the GPU is on and the fans are spinning. Putting them in the 3x2 (empty in the picture) results in no output to the screen and the fans dont spin, but it is on