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Yosemite 10.10.5 AMD problems ATI 7970 R2 ??

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My hardware is bulldozer - Fx 8350 

                                         - memory 16 gb

                                         - Grapchis Card Ati xfx! 7970 r2 doble dissipation

The problem is that when I connect the graphics card (HDMI connect) the screen goes blank, the tests were with GraphicsEnabler = Yes and GrapchisEnabler = No, probe also with FBrotate.app and doing the trick of sleep but the video card is showing a white screen any I could help?
the bootloader is Chameleon enoch 2.3.(compatible with AMD and Yosemite 10.10.5)

I need help to install the probe with some kext video card and sleep and fbrotate solution but I can not make it work, if someone can help me with this problem you would be very grateful.


Thank you in advance.

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