When I'm not using my 921, I turn it off. But every two or three days, I'll notice that although it's off (ie front power light isn't illuminated), the blue light (the HD output indicator) is on. I'm trying to figure out why this happens, and I think I know. When I first got the 921, with all the playing around with it's feature, it would frequently become unstable and require a manual reboot, which I did by a power cord disconnect or a smart card pull. If I did this while the unit was off, the blue light would always come on during the reboot process and when rebooting was finished, the power light would be off, as expected, but the blue light would remain lit. So, even though I now treat the 921 more gingerly and have only rarely had to force a reboot recently, I was beginning to think that finding the blue light on when the unit was off indicated that a spontaneous reboot had occurred. The other day, I set a timer to record a Showtime HD movie while I was at work. When I got home, the blue light was on. I checked the recorded movie in the PVR list and the movie was recorded in two segments. I'd seen this movie before, and by looking at the end of the first segment and beginning of the second, it appears that about 5 minutes of the movie is missing, approximately the amount of time it takes the 921 to boot. That suggests that the 921 happened to reboot during the recording and upon finishing rebooting, it still saw an active timer and started another recording to finish up the timer. This is the first time I've had a recording problem. Last night, I was watching a recorded show. I wasn't doing anything else and all of a sudden, the 921 rebooted. After rebooting, I watched the recording without incident, so there wasn't any problem with the recording itself. At this point I'm fairly sure that the solitary blue light does indeed indicate that the 921 rebooted while it was off. Has anyone else experienced the solitary blue light or have any other thoughts on this?