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Installed new motherboard and upgraded bios. MSc OS the proceeded with update install and booted after very long wait. Now fully functioning.

Thanks for suggestion, however no luck. New motherboard now on order!

Thanks, however as stated my machine currently won't even POST. Even if @Sniki had the fix ready now I wouldn't be able to apply it as can't even reach BIOS let alone boot a recovery drive. Has anyone else experienced similar hardware issues post this update?

This guide is great, it helped me get my system up and running a few months ago and has been running smoothly. However, last night I let Mac OS update to 10.14.5 and everything went pear shape! The update completed, but got stuck on first boot at about 20% of the loading bar. Eventually I power...