If you want to change your power button on the start menu to actually shut off your PC, rather than put it to sleep, here’s how.
The default for the power button on the Start Menu is putting the computer to sleep. If you would rather have your computer shut off the power when you hit the power button, follow these few steps to change the setting.
1. Click on the Start Menu | Control Panel | Power Options | Change Plan Settings
2. Click on Change Advanced Power Settings.
3. Browse to “Power buttons and lid”. From there, you can change the “Start menu power button” setting to “Shut down”. Also, you can change it to “Hibernate”. You also have the option to change the default behavior for the case power button.
4. Click ok, and your start menu power button will now shut off your computer.