hello, I have a NVIDIA Quadro NVS 290, which is similar to the 8400 GS and I think the same thing happens to us, after installing several kext (titan, nvinject, nvdarwin, natita ...) I can change resolutions but the picture is sharp, pixelated out as horizontal stripes. I am Spanish and English is not much but I think you got it all. you could get the problem? and hopefully if I can help jeje