That is normal until you put something on it. Unless you want a mirror image of the desktop (clone mode), leave it in extended mode. You can then put icons on it or move open programs (Windows Media player e.g.), while still using the monitor to work on.
If you plan on gaming on the TV, you will have to set the TV as the primary display or it will only run on the monitor.
One more thing, neither Windows nor the video card/drivers
knows which way you have the displays oriented (TV on right, monitor on left, etc). The fix is easy as all you have to drag one of them to the other side of the other,