So I bought a computer of of Amazon with 2 monitors. It just a normal dell optiplex 3020 but with 16gb of ram and 2tb hhd. the what I assume is the onboard graphics card is is the same slot where I would put my onda 1030 4gb ddr4 graphics card so I pull it out and put it in there but I have to unplug a wire on the back of the existing one. I install the graphics card and start my pc. It says there isn't a boot device so I put the original back in and boot it up with the wire and it works. My graphics card doesn't have a place to plug that wire in how do I fix this. Also I'm getting a new case so I done nessarially care that stuff doesn't fit as of right now.