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First post, please forgive me for any errors of omission. I currently have a Inspiron 1420/Vostro 1400 with Nvidia graphics running Mavericks 10.9.4. It's totally stable with no kernel panics, but there's one hitch: I don't get any sound from my onboard speakers. If I plug in my headphones, I hear everything loud and clear. I'm reluctant to tinker when everything is so stable, but I also don't want to stop when I'm 99% of the way there. Here's the steps/specifics of my install: I created a bootable USB using the most recent version of myHack, a copy of the 10.9.4 installation app, and the D630 Nvidia Bootpack. The installation went smoothly, but slowly. Since I had some time on my hands, I came back here and stumbled across Axel-Erfurt's amazing thread for D630's with Nvidia graphics. I didn't want to stop an installation that seemed to be proceeding smoothly, so I copied the Extra folder from his D630 Installer and his D630InstallerPost.zip to a second USB Drive. After the installation was completed and I was at the desktop, I plugged in the second USB and ran myHack -> install extra, and used the Extra File copied from the D630 Installer. Ran the D630InstallerPost.zip & restarted. Post restart, I found that I had everything except for sound. So, I downloaded and installed the VoodooHDA_V286_MAV.pkg from sourceforge. It's currently in S/L/E. That got me sound through the headphone jack, but still nothing from speakers. I've thought about copying the VoodooHDA.kext from the D630 Installer into S/L/E, but because it's stable I didn't want to tinker without knowing what would happen.

After following the guide posted by Herve I managed to successfully install Yosemite on my Dell D630 (Nvidia). I used the app store Yosemite 10.10.3 app for this install, Instead of using Clover on the USB Install stick I used Chameleon-2.3svn-r2437.pkg. For the Extra folder contents I used those found on on my Mountain Lion Install (you can use the 10.10 Bootpack). After a successful install and a little modifying I had SpeedStep working again after following Herve’s guide. Everything works just fine and from my day to day use I’ve found Yosemite to be more responsive than Mountain which I had on my D630 prior to installing Yosemite. Please watch the video to see how everything runs on my D630.