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With the laptop connected to the TV, push the Windows Key and the P key at the same time. You will see a windows pop up, see the attached image. You want it to be on the Duplicate or Extend option. You can also try the Projector Only option.
Assuming you have the proper video driver installed on your system after the reinstall, you should have the options to cycle through video output modes. On a Compaq nx6110, the keys to do this are Fn+F4. The F4 key has a symbol on it that looks like a large box with a smaller box inside that has vertical lines on both sides of it. Look for that symbol on your keyboard in case it's on a different key, or it may even say something like LCD/TV, which does the same thing. Press that key combination to cycle through the options. Normally those options are: laptop only, TV only, or laptop and TV, not necessarily in that order. If you get it so that you can see it on both, then you should look at the display settings on the laptop and make sure mirroring is turned on. Normally you can find this by right-clicking an open spot on the Desktop, then looking for either Graphic Options or Graphic Properties. If you don't see either of those go into Properties. From there look through your settings and try to find one that controls display cloning or mirroring, which is what would cause your laptop to output the same thing to an external display.
In the display the tv should appear as the second monitor - set the resolution to the native resolution of the tv (most likely 1920x1080), make sure the Extend.. option is ticked and Make this... option is unticked and Apply.
Now all you have to do to use it is to drag the window of whatever do you want to watch to it. Remember to drag it back to the laptop display before closing it or the next time you open it you will not see it.