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I was able to install Yosemite by using the boot-flags /amd npci=0x2000 USBBusFix=Yes.

In the beginning I got white screen but after the kext backup it started.

So I installed the web driver 343.02.01f01 but now it only starts in safe mode.

When I try to start in normal mode, it says "NVDA(OpenGL): Channel timeout!"

System: AMD Phenom II 1100t

2x EVGA GeForce GTX 460

20GB Ram

Mainboard: MSI 990FXA-GD65


P.S. Sorry for my bad English..

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