i have similar problem 5:1 mac. has 2 samsung evos in raid os via pcie. however, have startup disks in sata ii slots , external usb drive high sierra installed (created using 'install disk creator')
connected 4k monitor, screen stays blank
connected mini projector, 720p output shows apple splash screen.
have reset pram, nvram.
have tried booting in recovery mode , to boot selector screen these don't appear work. when try, remains on apple splash screen no boot progress bar. have stock graphics card (radeon 5770)
ideas?
in past upgraded os on non-raid disk , ccc pcie raid afterwards. time, can't option.
you might try removing every drive , peripheral save single spinner; try boot recovery.
if doesn't work, try install snow leopard dvd.
- able run apple diagnostics?
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