Well he does have a 50 foot cable, which is well beyond any spec for HDMI.. I've got a cheap 35 foot one that works fine, but 50 foot might just be too long.
But as you say it could be faulty install or interference as well.
Is there any way nfoitu to eliminate the short cables to test it? Though I'd be really surprised if it was the short cables, though it could be the # of connectors.
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Uncertainty is an uncomfortable position.
But certainty is an absurd one.
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