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Well, I can't imagine that there's a HD switch. If you're watching "I Love Lucy" you will never get HD - the technology just wasn't there. But if you go to YouTube and ask for HD videos you will get HD images to your screen. No switching required because that's all encoded in the signal/file. Likewise disc - if it's DVD you won't be able to get as good an image as BlueRay - the data is just not there in the signal.
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