So I finally bought a GTX 750 Ti. Got Yosemite installed on a SSD (clean install). Installing was fine, ran MultiBeast, deleted kexts, ejected USB drive, restarted, everything was working well. I was using a GT210 during the install and I was getting a clear HD resolution on my 24" monitor. Needed to boot with GraphicsEnabler=Yes so I went back into MultiBeast to enable that boot flag by default. Restarted without manually typing in any flags, everything looked good so I downloaded Nvidia's web drivers for 7th gen Nvidia cards for 10.10.5 (14F27) - I made sure I had the right build number by referencing it in my system settings. Downloaded, installed, restarted.
Replaced the GT210 with the GTX 750 Ti, booted up, I got 1/3 of the way through the loading screen when my monitor goes black, followed by "no input." Restarted using GraphicsEnabler=Yes even though I didn't think I needed to, got the same results. Restarted using nv_disable=1 and I made it into the desktop with no graphics support, choppy image and wonky resolution - to be expected after using that boot flag. I went into the Nvidia web drivers settings to check, turns out OS X Nvidia drivers were still selected, so I changed it to Nvidia web drivers. Figured that was the problem. It prompted me to restart so I did. Upon boot I again only get 1/3 of the way through the initial loading screen when my monitor goes blank followed by no input. I can only get it to boot using nv_disable=1 at this point.
Any idea what I need to do? Should I uninstall and reinstall Nvidia web drivers? Are there other boot flags or a setting somewhere I need to enable?
I have the Core 2 Dou 3.0GHz, 2GB RAM, Gigabyte 750 Ti (EVGA GT210 1GB during install via HDMI), Kingston V300 SSD boot drive, no other drives connected, connected to my monitor via HDMI to HDMI. I don't have an ethernet cable plugged in at the moment, nor did I have one plugged in during install. Yosemite 10.10.5 was downloaded from the MAS. Not sure what else to try at the moment.