Shut down the HP computer and turn off the television.
Connect the four-sided plug on one end of the adapter cable to the VGA port on the back of the HP computer tower. The pins in the plug must fit into the three rows of holes in the port.
Connect the round plug on the other end of the adapter cable to the S-video input on the back of the TV.
Press the source-signal button on the TV remote control, which may be labeled "Source" or "Input," until the HP desktop screen can be seen on the TV screen.