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There's usually an option on most laptops where you can switch off the screen when your connected to a external monitor. On most lappy's its something like Function Key (fn) + F4 or F5. Have a look at the keyboard, the Function keys are normally highlited blue on the keys. You should be able to cycle through a few options, like CRT (external monitor (what you want)), LCD (lappy screen) or CRT+LCD etc. You'll need to futz with the settings until you find what you need.
Make sure that you don't have your 'Power Saving' settings fixed so that it shuts down or hibernates when you shut the lid.
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