Your Dell Monitor does not have a video output. The DVI/HDMI cable needs to run from the DVI-Out of you computer tower directly to the TVs HDMI input, ideally one with a red/white analog audio input next to it, because that cable only provides a video signal. If you don't have a DVI out on your computer, perhaps your TV has a VGA input. If your computer/video card only has one monitor connector, then you can only connect the Monitor OR the TV.
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