You can also use your TV for this purpose. If you can get a picture on the second display, it may mean your computer is capable of showing a picture but there is something wrong with the built-in ...

If your second display is recognized by the system but is showing a black screen, you might have it set to only show a picture on the laptop screen. In Windows, open Settings > System > Display ...

You can also use your TV for this purpose. If you can get a picture on the second display, it may mean your computer is capable of showing a picture but there is something wrong with the built-in ...