I gave up on cable box Power commands years ago. I make a point of omitting them from my programs. At one point I could use power sense on the AC outlet, but these outlets have been disabled on the older boxes and eliminated on the newer boxes. On some boxes one can sense composite video -- all of this fuss to tame the power toggles. You might have some luck sensing power on a USB port.Occasionally, I'll come across an Easter Egg sort of trick that controls power, but the next firmware update often wipes these out.I tell customers to never turn OFF the cable box and warn them that a visitor might track down the box and turn it OFF anyway. While this seems crude, it has not been an issue.