Originally Posted by bkdtv
Many TVs respond to audio signals they do not like by emitting high-pitched, screeching sounds. If using the TiVo direct to your TV, be sure to set the TiVo to output PCM under Settings -> Audio -> Dolby Digital.
That may very well be true, but the main problem is that the TiVo is crashed and completely locked up. It won't even flicker the yellow light to indicate that it detected a signal from the remote. Getting the audio settings right is not a high priority at that point.
I've experienced this myself a bunch of times in the last year or so as well. I have no idea what causes it or how to prevent it.
For a while it happened once a week, then it would go a few months between instances.
Two nights ago it happened (after not happening for a few monts) and this was the first time it happened while I was actually watching it. The whole screen had some pixillated flickering for about a second, and then the screen went dark and the beeping started and the TiVo was completely unresponsive and required a powercycle.
Interestingly, about an hour or so before this happened, again while I was watching it, the TiVo spontaneously rebooted itself.