Switching screen off on Tecra and using external monitor/LCD TV

I recently bought an LCD TV and was looking forward to using it as the monitor for my Toshiba Tecra M2V. I have run into problems.
I seem unable to "turn off" the laptop screen and ONLY use the LCD TV screen to cary out work, play games etc. Rather I seem only to beable to COMBINE the LCD screen with my LCD, effectively creating a "two screen monitor". I have followed all the online help and still I am unable to have only one screen.
I just want the LCD TV as my screen!
Any ideas on how to do this? It is really a pain!!
TIA

Hello
Usually you should be able to do it using FN+F5 key combination. As far as I know if the unit is connected to the TV you have three possibilities (maybe depends on notebook model) LCD only, LCD and external device and just TV.
You can also try to switch it using GeForce properties:
Display properties > Settings > Advanced > GeForce tab > Device Settings > Select output device.

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Switching screen off on Tecra and using external monitor/LCD TV

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