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So I was finally able to install macOS back on my machine a couple weeks ago, as that's when the Pascal driver were released. I've had basically zero issues with the build since, except now I'm getting that stop/prohibited sign upon boot—and I can't even boot in safe mode (I've tried using the...

So title pretty much says it all. I was ok booting into both Mavericks and Windows 8.1 previously with my old 6870, but once I installed the 280x is kinda when it hit the fan. I can get into Windows 8.1 fine—and the card performs fine, so I know it's not malfunctioning—but when I try to boot...