I know this may be a dumb question but I have to ask because even though the cable company has HD boxes a lot of them still dont have HDMI outputs instead they use the 5 Component cable (red,blue,green,for video and white, red for audio). Not only that most of the cable guys are not the brightest in the world I work in an electronics store for 13 years and cant tell you how many times I went to someone house and it was hooked up wrong. Are you stuck on HDMI-1 or can u chnge the channel by using the tv/video button it may say input as well. Check how its hooked up easy to tell 1 cable HDMI, 5 cables -Component. If it is HDMI check the other hdmi input as most LCD tvs have at least 2. same for component it will say component on screen
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