For ENERGY STAR® compliant computers, the following power plan takes effect by default when your computer is on ac power and has been idle for a specified duration:
Turn off the display: After 10 minutes
Put the computer to sleep: After 10 minutes
Turn off the display: After 5 minutes
Put the computer to sleep: After 5 minutes
Go to Control Panel and view by Large icons or Small icons.
Click Power Options.
Choose or customize a power plan of your preference.
Go to Control Panel and view by Large icons or Small icons.
Click Power Options, and then click Choose what the power buttons do on the left pane.
Change the settings as you prefer.