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by blowski 3465 days ago
I had a similar experience. Two identical looking cables but one was mini display port, the other Thunderbolt. An old Mac Pro could be used as an external display with one cable but not the other.
1 comments
manarth 3464 days ago
Seen that, with conference speakers stressing out minutes before their talk, about why the laptop > projector adapter isn't working.

It's the worst-case scenario: adapters/connectors that appear identical, but behave differently.

link