Mac Pro 3,1 running 10.14.5 Mojave via Dosdude1 patcher, an OEM Nvidia GeForce 8800 running fine (thank you guys). A newly-acquired flashed Club GeForce GTX 680 4GB is showing correct boot screen but no image after boot, either DP or DVI. Should I just reinstall, this time with OCLP, or am I missing something simple here?