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Yosemite AMD Black Screen/No Signal After Second Boot

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First,thank you Niresh,you are a great man!!!!!!!!!!!!  ;) 


So I'm installed Niresh's Yosemite distro into my AMD config. Everything is works fine until the second boot. 


When the installer done,I'm restart the computer. Everything is works fine. Full HD resoultion,and each other.. When the OS says "Your computer optimized,please restart" Im restarting the computer,and after the boot I have a nice black screen.. 


I'm tried to GraphicsEnabler=Yes,no,nv_disable,and,backup graphics kext,that's works fine,but I havent got full hd resoultion.. 


What can I do now?  :wacko:


On Mavericks everything's works fine.. 


My specification: AMD Athlon 64 X2 DualCore 5000+ Processor

                              ASUS M2A-VM motherboard

                              nVidia GeForce GT620 VGA


Sorry for my bad english,I'm hungarian..  :)

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