On your PC’s desktop screen, right click the desktop. (On a laptop you can do this by clicking with two fingers or clicking in the lower right corner of the trackpad.this will bring up a small menu.

In the right-click menu, select “Display Settings.”

Scroll Down to the Multiple displays area. Select “Duplicate these displays” to mirror your PC’s display to the TV.

Your computer screen and the television should now be showing the same output.