It exists, but it's hard to find. As in, it's right next to restart system in the setup menu. Why it would be useful is beyond me. If it really does record things while in SB mode then what's the point? Everything that could fail is still running, just not outputting video. And if it DOES prevent recording live buffer, then I wouldn't want that either. Then again, I never turn off my VCR, Amps, DVD, or CD player either. Mebbe I just like the little glowing lights.