I have an old tv that only has a red yellow and white connection and my laptop has an HMDI connection so I got an HDMI to Composite cord to watch movies from my laptop on my TV. The thing is it does not work. I plug it it and change the channel to "Front". I have a Panasonic Tv and that the channel i turn to to play xbox using the composite cables so I assumed it would be the same as connecting my laptop but when I did nothing happened. The screen just stayed black. Can anyone help Please?