Why do i receive no hdmi output from windows 7

Hello,
i just bought a new dell pc, with a HDMI output on the back. ive connected it up to my HDTV but there is no signal. why is this so? and can anybody suggest a solution?
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  1. yeah that dosnt work... i have previously tryed it, and nothing then either. is there another way? do i need to install anything?
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