If running Windows 7: Right click on the desktop Screen Resolution Right click on the screen that is not activated Choose activate.
Keep in mind that if you want to see the same display on both screen ie dual display then it will set the resolution to the screen with the smallest resolution, which may look a little sucky if you are running 1080p TV with lower resolution laptop screen, the other option is to choose extend screen
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If running Windows 7:
Right click on the desktop
Screen Resolution
Right click on the screen that is not activated
Choose activate.
Keep in mind that if you want to see the same display on both screen ie dual display then it will set the resolution to the screen with the smallest resolution, which may look a little sucky if you are running 1080p TV with lower resolution laptop screen, the other option is to choose extend screen