Hey everyone, long time lurker. So I was gifted a Mac Pro that's from 2008, and to my surprise it didn't not have a graphics card or a hard drive I can boot in too, and when I try to booting into a OSX 10.11 install usb, it would boot in but would not display any video. I only have a GTX 780ti on hand and don't have money to buy a graphics card compatible with it. Is there any way to install OSX with this card or am I out of luck. Thanks in advanced everyone.