TiVo Help Center
When it rains it pours.
TivoHD normally sits on a UPS, but we had a prolonged power outage about 3 weeks ago that lasted a full day so at some point the UPS was empty and even the TivoHD went dark.
Next day, power is available, turn on the UPS ... and notice the TivoHD stays dark. Ugh.
Pull it...