I have connected my macbook to my LCD TV using the Mini DVI to HDMI connector and all I get on the TV screen is my macbook wallpaper?
After some time I have managed to display the Preferences panel and cursor but cannot get it to act as a monitor for any other application.
Any ideas please?

After some time I have managed to display the Preferences panel and cursor but cannot get it to act as a monitor for any other application.
Any ideas please?