Interesting. I have a D630 running 10.8 without any really spacial kexts installed, but to get my Opti 745 running 10.8 I needed to fix the NVDANV50HAL kext to have my device ID, then it worked reasonably well in safe mode, but not any other way.
Loading 10.9 using the Extra folder that Dan provided, I could see that NVDANV50HAL loaded and regiusterd my 8400GS, which pleased me. However, as soon as it did that, the screen went black and into standby. It sounded like the machine was still running since I could hear it accessing the hard drive.
Any ideas on what's causing that?
I'm certainly no noob when it comes to OSX86, having been doing it since the Tiger era with many different methods. I'm a unix programmer by trade, and comfortable at the command line, so if there's any info I can get you, please let me know. I've just never run across a graphics driver that fails so silently and completely. It doesn't give me a hook into seeing what it's doing, so if this is something anyone else has run across, I'm open to suggestions.
Thanks!
--Justin