Yes. You can connect your computer to your TV via audio and video cables. For audio connections, use a Miniplug-to-RCA stereo audio cable to connect the headphone jack on your computer to the audio input on your TV or stereo (red is for left audio channels and white is for right audio channels). For video connections, if your computer has an S-video port, use an S-video cable to connect to the RCA jacks on your TV. If your TV and computer have VGA or DVI ports, you may be able to connect the display like a monitor.
You can also use an HDMI cable to connect your computer to your television. If this type of cable is used, you will not need another cable for audio.
Check your TV and computer user manuals for more information.