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.
She was treated with DHPP tautode in a 30C potency, and in the 6 months before I lost her as a patient because of moving, she had only had one petit mal seizure. I had a really good doctor back in 1993, and I was diagnosed with petit mal seizure disorder and left temporal lobe swelling, which I knew a lot of artists had had.