I've had a Hackintosh running for 3 years now using Mavericks 10.9.4 and suddenly today the hard drive would not boot the system. I had planned to upgrade to Sierra anyway so I had a brand new 512 GB SSD ready to do a fresh install. I downloaded the new version of Unibeast and Multibeast...
I only have 1 2.5 drive and that's my SSD system drive. What is odd is that the issue is lessened by only having 1 USB 3.0 device plugged in versus 2. E-SATA worked fine by the way.
I was able to solve the issue by adding the following line in my Boot list:
was:
<key>Kernel Flags</key>
<string> nvda_drv=1</string>
now:
<key>Kernel Flags</key>
<string>npci=ox2000 PCIRootUID=1 nvda_drv=1</string>
added:
npci=ox2000 PCIRootUID=1
Thanks for the help.
The problem happens with my 1 TB Western Digital Enterprise drives so I don't think size seems to matter, at least for my build. It ejects as soon as the drive has to write something. My bios is still version F5. Like you, if I plug it in with USB 2.0, it works fine. I'm trying out E-SATA now.
I have the exact same problem as you. I have the GA-X79-UP4 board with an i7-4960K chip and any USB 3.0 drives ejects as soon as you try to write to it.
I'm in a similar situation. I have a GTX 780 ti and I can't get it to load. It always goes to a black screen. I've installed the new nVidia drivers, edited the bootlist file and still can't get it to work.
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