1) You will not actually "have" HDTV unless you are receiving it from either your Cable TV provider, your Satellite provider, or over the air via antenna. Not all Cable or Satellite boxes output HD to your TV. Check with your provider!
2) Use the right cable to get the HD signal to your TV. S-Video and Composite video do not support HD. You must use Component video, HDMI or DVI for HD. It is often a good idea to use an analog Component video connection along with a digital DVI/HDMI connection in case the digital connection fails due to HDCP incompatibility or other issues.
3) Check the settings for the output of your cable or satellite box. HD is either 720p or 1080i. 480p and 480i are not HD!
4) Do you have a home theater system? Does it have a digital audio input? If so, you should make sure to use a SPDIF RCA cable or Toslink optical cable from the Cable or Satellite TV box to the Surround sound Receiver. Make sure to set up the Receiver to use the digital audio from the input you connect to. It is a good idea to also run analog audio cables to the receiver as well, in case some stations do not put out a digital signal, or the digital connection fails.
5) You won't be actually viewing HD unless you actually tune to an HD channel! Your Cable or Satellite Box only will have a limited number of actual HD channels.
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