PC connections
I use the VGA output from my laptop and the TV happens to have a VGA input. If your doesn't, you can get an adapter to go from VGA to component video.
For audio, your laptop has a digital audio output (SPDIF). It probably uses a digital coax type connection w/ RCA connectors on each end. Any modern receiver will included this type of input, but you might have to use analog audio (red/white RCA connections) to connect directly to the TV speakers.
Check out monoprice for inexpensive cables.