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.
Recently several studies have suggested an association between autonomic small fiber neuropathy and postural orthostatic tachycardia syndrome. Other notable studies have shown a link between erythromelalgia, and fibromyalgia. SFN is a common feature in adults with Ehlers-Danlos Syndrome (EDS). Skin biopsy could be considered an additional diagnostic tool to investigate pain manifestations in EDS. Diagnosis. The diagnosis of small fiber neuropathy often requires ancillary testing.