|All you need is a cable that is compatible with the video card outputs and the TV inputs.|
IN order of preference that could be:
You can get an adaptor cable. For instance if your computer has DVI out and you TV has HDMI in then it is possible to get a DVI to HDMI convertrI. Being a HDTV it will almost certainly have a HDMI input. Not all computers have an HDMI output although some do.
In all cases except HDMI to HDMI you will need an audio cable from you sound card to the TV audio in.
However be aware that depending on the resolutions available from your video card and the capabilities of the TV you may be disappointed with the quality.