Only seeing desktop background on LG TV from iMac

I connected my iMac via mini-DVI to VGA on my LG TV. When I choose the input on the LG, I am only seeing the desktop background but with no dock or windows. When I try to select the LG in Detect Displays in Preferences, nothing happens. What am I doing wrong?

HI Emiko,
By default Mac OS X uses an external display to extend the desktop. If you want to mirror the built in monitor you need to enable it.
go to the menu bar
click on the apple menu
chose system preferences
click on display
click on the arrangement tab
check "Video Mirroring"
happy new year!

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