Today I finally installed MacOS Sierra on my system. Before the installation, I took my graphics card out and did the whole thing using my onboard graphics. Everything works, I installed the Nvidia drivers, put the card back in and rebooted normally. The only thing I noticed was that my screen stayed black when I was supposed to see my BIOS splash screen and Clover. Since I'd like to try to update to High Sierra soon and still need to use Windows from time to time, it's incredibly inconvenient not being able to use my boot loader.
To change this, I went into my BIOS settings and change primary video controller from "Onboard" to "PCI". Now I got to see the ASROCK logo and Clover options, but the system wouldn't boot into MacOS. Using the bootflags -v and -x I got the error "Error allocating 0x#### pages at 0x####alloc type 2". A possible solution to this as denoted in this article: https://www.tonymacx86.com/threads/solved-error-allocating-0x-pages-at-0x-alloc-type-2.182907/ was to replace OsxAptioFix2Drv with OsxAptioFixDrv. Again, no luck. In fact, this fix broke my installation. I'm somehow unable to mount the EFI partition, which means I can't revert it.
Currently, the only way to boot into my system is with primary video controller set to onboard, HDMI cable plugged into the motherboard and using the bootflags: -x -v and NVdisable=1. I'm definitely going to do a new installation, but did anyone encounter the same problem and maybe even fixed it? Glad to hear from you.
My specs: Motherboard: Asrock Z77 Extreme4 CPU: i7-3770K GPU: Nvidia GTX1070
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