Hi guys! My first time trying this method, The instructions where helpful, I've followed it by the book, and I'm conscious about there are many issues related that the newer systems are designed to co-work with newer hardware and with this procedures basically we are forcing software to collaborate with older hardware. This time I used a MacBook 4,1 with 4GB of RAM and a 240GB SSD, and after the MPF procedures to install Yosemite, I've got graphical response as I'm started on "Safe Boot Mode", only one screen resolution (I think an average user can live with this) but I've got no audio. Any of you guys have much more experience with this affairs, did any one find a solution for the "No Audio" issue? Thank's in advance.