When you connect, you need 2 cables connected, one which has two screw things either side of the connector which im assuming is the one you have already used and a cable with a red connector and one with a white connector, these are called auxiliary cables and provide sound. you will know if you have these.
Assuming you've used the 15pin VGA cable ( http://vgatodvicable..../07/vga-connector.jpg ) then you also need to connect the headphone/speaker out on the laptop to the PC audio in on the TV.
Yeh, havent been on for a while, been busy at work, i wondered if anyone would notice i hadn't been on for a while, im touched, lol. :-) hopefully i shall be keeping up with answerbank from now on. :-)
As I said, check the input on the TV before buying anything, most PC audio inputs on TVs are 3.5mm jack (headphone type connectors) as I linked to, but some are twin phono plugs like benny linked to.
also if it's a plasma be very careful about leaving the same image on the screen for long, because you will get screen burn. if it's a LCD nothing to worry about.
It will weigh half a ton and get very hot after long use.....
Or just stick the model number into google :)
screen burn is something to be very worried about on plasma screens when used with computers, it would only take a few hours of displaying the same menus at the top of the screen for it to start to get screen burn.