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When paired with both my TV and stereo, the power all button doesn't do anything. When paired with TV only it DOES work. When paired with TV and stereo, TV power button only controls the stereo. Stereo is connected only to TV via the optical cable, not to the contour box. Tried multiple codes for TV and stereo. None work for power but do control sound level. Contour box does control channel change.TV is Sharp Aquos. Stereo is Panasonic DVD/Surround sound Stereo. Both are at least 15 years old.