I did exactly according to this guide, but I got problem for the graphic card. I can't change the resolution. When I injected following sentence in the plist file, my screen always turned into black and then computer rebooted.
<key>Graphics Mode</key>
<string>1920x1080x32</string>
My configuration: P8Z77-I deluxe, I5-3570K with HD4000, 16G RAM,
I'm using displayport to connect to my 27 inch display, when I changed 1920x1080 to 2560x1440, it also doesn't work.
There is only one resolution available: 1280x1024. The OS can recognize HD4000, but it seems no kext loaded.
Anybody could help? thanks