Intel PRO / 1000 PT Dual Port Server

I just bought an intel pro 1000 nic to turn my optiplex 780 into a pfsense server, but whenever I plug the card into the pcie 16x slot, it thinks that it disables the onboard graphics. I have searched online, and I have learned that it automatically disables the onboard graphics when it detects...

video card is fully hooked up, new z170x mobo intel. I haven't built a computer in a while so maybe i missed something? Everything seems to be getting power, everything seems fine, but no post beeps (my last gigabyte mobo didn't so idk), no signal on the monitor whatsoever. I'm just...