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Sierra black screen on boot- iMac17,1 and Skylake

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Hey All,
Totally confused here... I was running El Cap fine and dandy, with SSDT patches in place and working. Upgraded to Sierra, and now for some reason I end up with the black screen problems that I was faced with when I first built this Skylake-based beast.

The only way I can get into it is by switching into iMac14,2... however running with that disables the Skylake CPU support.

So far I've tried nv_disabled=1 (which does not work), rebuilding the SSDT patches (which does not work),...

Sierra black screen on boot- iMac17,1 and Skylake

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