The HPNA light is only on if a device is using that connection, usually a STB connected via coax (can be over twisted pair in rare situations like apartments). It sounds like your setup uses ethernet which would not turn on the HPNA light.
The previous scene is an excerpt from Brain on Fire: My Month of Madness, and just one of many hallucinations Susannah Cahalan experienced in 2009 during her month-long hospital stay, in which she was diagnosed with a rare neurological autoimmune disease, known as anti-NMDA receptor encephalitis.
It appears most often in kitties as conjunctivitis, which is inflammation of the tissues of the eye (pink eye). Sometimes feline chlamydophila is referred to as feline pneumonitis, indicating a problem with the lungs. However, most symptoms of a chlamydophila infection in cats involve inflammation of the tissues surrounding the eye and the upper respiratory tract only. Feline chlamydophila is part of the feline upper respiratory disease complex, which is a group of viral and bacterial infections.