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.
In Texas, Booth met a lawyer named Finis Bates and they became friends. At the time, Booth was calling himself, John St. Helen. Five years later, St. Helen became very sick and thought he was going to die. He made a deathbed confession to Finis Bates that he was really John Wilkes Booth. Booth recovered.