HDMI stopped working on both my macs

Ive got two late 2012 mbp's. First, one of them stopped detecting external displays. My other mac worked perfectly fine with the same adapter.
So i took it to the local store and they tested the mac with other adapters and display combinations. They told me HDMI doesn't work at all.
THEN my other mac (which worked perfectly fine) stopped detecting external displays to. How can this be? Can a adapter or HDMI cable
render a port useless?
Please help.

Haha, may have been logic board issues? Are they connected to the same power outlet? It could have fried the ports

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