I've just bought a MP 1,1 from eBay, without graphics card, and with 10.7.5 already installed. I bought a Zotac GTX 570, too [ I want to be prepared to install Yosemite as soon as I get the packet at home ]. My question: GTX570 is a non efi card. Will it work DURING the installation process? I suppose that I can start the computer under Lion wo. problem. I know the GTX will work under Yosemite and Lion, but what happens during the installation process? Will I get signal in the monitor if I install Yosemite from an USB with Piker-Alpha-Tiamo solution? Thanks in advance.