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I tried what you said, and it's doing the exact same thing. I get a white screen after the Apple logo. I only see the cursor wich I can move. I already tried the White Screen Fix without success. I'm not able to put my computer to sleep.
I have an MSI R9 270 and I'm trying to get my card detected in Mavericks 10.9.3. I tried Vlada's kexts pack and everytime I install the modified AMDRadeonX4000, I get a white screen. If I patch the AtiConnectors in clover, I'm getting a black screen. But if I don't use the modified AMDRadeonX4000, I can login, but without 3D Acceleration... I'm not using the ATYInjector because I prefer clover, but I can't figure how to get this working...