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Primary Monitor black screen while Secondary is on

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Jul 5, 2011
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9
Motherboard
Gigabyte SKT-1155 Z68XP-UD3
CPU
Intel Sandybridge i7-2600K Unlocked Core i7 Quad-Core Processor (3.40GHz, 8MB Cache, Socket 1155)
Graphics
Sapphire HD5770 1GB GDDR5
Mac
  1. MacBook Pro
Classic Mac
  1. 0
Mobile Phone
  1. iOS
When I installed Mavericks I believe I had to install with only 1 screen active and then when re-adding my primary monitor it would have a black screen for 3-6 minutes before turning on to appear the Login Screen. This is the same issue I am facing again after updating my BIOS to one that supports UEFI and also now moving to Clover.

I remember this possibly being related to having to set which GPU is initialised first in the BIOS however I remember bypassing the issue possibly by upping the integrated graphics memory. Not sure if anyone else has experienced this issue before, I know it's fixable for sure but I've since forgotten how I did it but it's definitely on this forum somewhere.

Thanks for your time, I'll be sure to note it down this time.
 
UPDATE: Curiously this only happens when booting directly from the HDD. When using the Clover boot loader installed on the USB it immediately turns on.
 
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