Firstly I just want to thank everyone in this community. It's thanks to this site with it's information provided by the community that has made this possible.Update #1 - Now working with OS X 10.10.4Update #2 - Internal display working (no need for external display) - No performance loss, no paid software and still have sound Update #3 (27th September 2016) - No longer using Windows 8.1 on EFI, now using Windows 10 on Bootcamp (BIOS)So here is my guide!I have a Mid 2012 15" Macbook Pro Reti