Mac Pro 2019 Radeon Vega II MPX Issue with HDMI not turning on
Older OS, Monterey...soon will move to Tahoe. Maybe a cause?
Anyway, have an HDMI connected and 2 Thunderbolt 3 to HDMI cables.
HDMI would not output to monitor. Moved both Thunderbolt cables to Bus 1. Success.
Apple docs on this card connections:
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