Does it also allow you to turn the radio completely off? If I hold the power button, mine goes to the clock with no sound like I wpuld expext if it is off. But when I restart my truck, after the welcome screen is done, it reverts back to the radio screen with sound "muted" (speaker icon with x on it) as if it was not turned off, just muted. When I touch the power button, it un-mutes and begins playing. Occasionally, if I turn the radio off to the clock screen, it will start this way after the welcome screen. Never had a radio before that I couldn't turn off. I have the Bose Nav radio in my Silverado LTZ.