This is what happens with a damaged or underspecced cable. The HDMI standard doesn't have a way of telling you that you really need an HDMI 2.2 cable and you a

This is what happens with a damaged or underspecced cable. The HDMI standard doesn't have a way of telling you that you really need an HDMI 2.2 cable and you actually have an HDMI 1.x cable. It just tries to send the signal, and if the analogue bandwidth of the cable is insufficient, then the error correction will be insufficient and you'll get no signal or snow and blocks. This is somewhat of a good thing, since many short HDMI 1.x cables will work for standards that require HDMI 2.x.