So I think you are referring to the possibility of power being supplied to 
the SYS_5V rail through P6-19. So basically, the test procedure would be:
 
(1) Plug in 5V power cable.
(2) Plug in HDMI cable
(3) Wait for everything to boot up
(4) If it BB fails to boot, see if RT1 tripped due to a possible difference 
in competing 5V supply rails.
(5) If BB boots all the way, remove 5V power cable.
(6) If board is still running OR if RT1 trips at that point, then I know 
monitor is trying to power board. Otherwise, I'm good to just leave it 
connected from that point forward.
 
Is that a fair test?

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