Hi all!
Bit of a strange issue here. Just updated to 10.12.6 from *.5. No problems except that on initial boot after the update, the display was blank. Pressing command+alt+escape for the Force Close dialog created an audible beep so the system was responding, but with a blank screen.
This issue is avoided, consistently, by very simply loading the Clover options, SMBIOS sub option, and merely selecting and then activating the value for the "Product Name" option. No change needs to be made. After doing so, resuming the boot process works fine and the display works properly. To clarify, merely selecting the value and going into edit mode for "Product Name", making no change, pressing enter to "save" the "change", and resuming the boot process fixes the blank screen issue.
Repeating this processes by attempting to initiate a change with any other value will not fix this. Only Product Name. This will consistently fix the issue across multiple boot attempts in a row. It will consistently boot with a blank screen without doing this.
The current Product Name value is "iMac14,2". Booting with -f or -v does not fix the issue. Booting with nv_disable=1 does fix the blank screen issue but of course there's no nVidia driver so the display quality is crap.
Hardware:
Core i5 2500k GTX 650 2GB, 2x DVI monitors running Gigabyte GA-Z68MA-D2H-B3
Software:
UEFI with latest Gigabyte firmware Latest Clover boot loader version Sierra 10.12.6
This config has been in use since 2011 without much in the way of major issues so there's probably some cruft in the config.plist.
Config.plist: https://pastebin.com/aFmSUuf1
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