Now, keep in mind that your TV will have to be on correct input or source in order for you to see anything. It does not happen automatically. If you use HDMI the source will probably be named HD-# or HDMI-#. You will have to see what # port you have the cable plugged into. All TV inputs should be numbered or named accordingly.
If you have correct source (input) selected on TV you will need to tell your laptop to display image on your TV. Most laptops have a keyboard shortcut to enable the additional display or monitor. Different manufacturers have different shortcut keys assigned, but they tend to be and Fn key in combination with one the F# keys. So, Fn+F#. Once you find the correct F# key you will be prompted to select an option of how you want to connect to your external monitor (HDTV). If you have Windows 7 you can hit the windows key with letter P, which should provide you with similar options.
Most of the standard desktop keyboards do not have the Fn key option so you will have to enable the external monitor manually. To do that right click on your desktop and select (display) properties (if XP) or screen resolution (if Win7). If you PC recognizes new monitor you should see it as number 2. Click on it and select expand windows to make the TV act as second monitor in XP. In Win7 you will get an option to select how your multiple displays act. By default they will be cloned. What your screen shows TV shows as well.
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