Sierra ATI Radeon HD 4870 Black screen

[iyohmamma]

Installed Sierra on ASUS Rampage Extreme II, Intel Xeon, with ATI Radeon HD 4870 graphics card. Video on El Capitan works with Mackbook Pro system definition, however none of the existing system definitions in MultiBeast work. I only can get video by starting with a usb Unibeast. Please advise.

 

[P1LGRIM]

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