If you want to turn off the monitor using the power button of the notebook, then you can change Windows settings in the following manner: But you can use some features of Windows 8.1 or Windows 10 to turn off the screen whenever you want. But the notebook computers usually do not come with any designated power button to turn off the monitor. These display screens come with a power button of its own and you can use this power button to turn off the monitor or turn it back on as you want.

A typical desktop computer has a separate display screen (also called a monitor) that you attach to the rest of the computer cabinet through video cables and a power cable.