I had similar problem, Grey boot manager screen on cold boot, Clover on warm reboot.
My old system, GIGABYTE GA-P55A-UD3, Intel Core i7-860, 16 GB RAM, Radeon HD 6850, dual boot with OSX Sierra and Windows 10 on two separate hard disk drives has been very stable for a year.
The symptom started...
I had the same problem: No HDMI audio after 10.12.4 update.
“audio_cloverHDMI-120.command” method (post #6) fixed it.
Thanks! Toleda and CitizenK
Gigabyte GA-Z97N-WIFI
Celeron G3258
Nvidia GTX745
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