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.
Medical Conditions. cerebral palsy, which is a group of neurological disorders that causes muscle paralysis and loss of body control. Legg-Calve-Perthes disease, which is a disorder that causes the thighbone to die due to lack of blood flow to the joint. sepsis of the hip and other joints, which is a bacterial infection of the joints.