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I was using an unrecognised pcie helper card (for my rx480) and the minute I removed it the '3rd screen' disappeared. OSX is making some allowance for it I think, even though it's not in use..

I've flashed the vbios, tried ATI inject on/off on my 1156 system i7 870 with ref sapphire 480 8gb and still black screen. Fans whir up then nothing. Fake ID is in clover and framebuffer listed as @rhys216 has said. I regret getting this card now as it was intended for FCPX. The forum can't...

Ati Ati inject? Nothing else.... tried this an nothing then. Can only assume the vgabios didnt flash. Is there a more thorough thread on the process @rhys216 ? Were you on previous OS version than 10.12.4?

Windows is running fine btw with the vbios edit

@rhys216 I have flashed my Sapphire RX 480 with the same parameters... what further is needed to enable? I have no IGFX (H57) but have you done the additional kext editing on x4100 and 9500? I am running 10.12.4 final.

Think the infoplistpatch might be essential to this? Latest beta 16E191a - listing properly in sys report but 7mb :(

Can you detail or screenshot the hex conversion thing for find and replace in clover - I can't seem to access the infoPlistPatch button unless I do. Thanks.