Connecting MacBook to an External Display

I have a mini dvi adaptor and DVI cable to connect my macbook to my LCD TV.
What I want to do is watch movies (either in iDVD or not), downloaded video and anything else that is possible (extended desktop etc)
So far, after connecting all the cables, all I can see on my LCD TV is my desktop picture from my MacBook.
What else do I need to do?
Cheers

Apart from what Howard Chernin already explained, there are a couple other things you could do:
- Hit the F7 key on the MB's keyboard. This will toggle from extended desktop mode to mirror mode. In that case you will see the same thing on the TV as on the MB's screen. Or you can...
- Close the lid on the MB so it goes to sleep. Plug in the MB's power adapter if it isn't already. Plug in a USB mouse to the MB. This should cause it to wake up and the TV will now be the only active screen. Once the TV comes on as the main screen, you can open the MB's lid if you like and the MB screen will remain off.

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