Although I never experienced this myself since I didn’t use UEFI or secure boot until just now. I investigated about black screen problems and found some solutions related to setting permissions again to fix it. I already fixed it in upcoming OS X Mavericks Transformation Pack 3.0 so you shouldn’t need to worry about this issue after installing it but for some people who are experiencing black screen problems, this article will provide you step-by-step solution to fix it.
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