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hmmm i'm not going to reinstall windows :) How do I repair the boot sector?

any ideas on how to fix the "the operating system is not found" error when choosing Windows NTFS?

Thanks for the help! It says Bios mode UEFI. I also have "EBIOS read error: Error 0x31" when booting to Yosemite. Does this have anything to do with that?

I've got Yosemite up and running smoothly on an ssd and I also have another ssd from which I boot windows 10. Both boot perfectly but i have to go to the bios to boot windows. When i boot to yosemite I can choose Windows NTFS but then I get the error that the operating system is not found. Is...

Ok Thanks a lot! If you could help me installing sierra that would be great but in the meantime i'll make do with mavericks :)

hmmm but I can't get the Sierra installer past the "waiting on <dict ID=0>" error. Any idea's to fix that? Or alternatively, would it be possible to have them both plugged in so that I can use the RX480 on my windows boot and the HD7970 for MAC?

So if I want to use the Rx480 I need Sierra?

Here is the zipped Clover folder as you asked. Also, on mavericks though, multibeast installation failed :(

I am currently installing Mavericks without the need for bootflags! If all goes well I will be able to boot in 20 minutes :headbang: Thanks for the help! Currently my HD7970 is plugged in. I wonder if it will work with the rx 480 edit: It worked! I am up and running with mavericks!

I'm going to try installing Mavericks later today, I'll keep you posted on the progress!

Done :)

Thanks for your reply! I will do as you said when I get home. Might it be better if I install an older version of mac os?

I've got the same problem, have you found a solution yet?

My system: Rampage IV Extreme Intel i-7 3930k Standard RX480 (Also have a HD7970 but I get the same error with this graphics card) 32gb ram SSD samsung 850 Pro 250gb I have unplugged all of my harddrives and only usb mouse and keyboard are plugged in together with the USB stick made with...