Could it be something like CPU generated just enough heat to be passively cooled and having hdmi plugged in causes use of pci and the CPU heats up ever so slightly to trigger the need for cooling?
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The PC isn't connected to power though, so somehow the fan has to be powered from the HDMI cable...
Hahaha what the fuck 10+ years in the IT industry and a life time of playing with parts and I’ve never seen this. Does HDMI even transfer power??