5500 board won't POST/chime w/o the Display hooked up?

Trash80toHP_Mini

NIGHT STALKER
68040
I've got a test rig that'll boot Alchemy and Gazelle boards, but not my AIO 5500 sub-variant of Gazelle. Does it fail to POST due to lack of internal CRT hookup or might there be another issue with this particular board?

If display is indeed the problem, will it POST with the external display/projector cable in lieu of the A/B CRT hookup?
 
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