Lenovo B4400 Notebook - Manual (Page 29)

Related service information
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Note: Power management modes are not supported for APM operating system.
To reduce power consumption, the computer has three power management
modes: screen blank, sleep (standby), and hibernation.
Screen blank mode
If the time set on the “Turn off monitor” timer in the operating system expires,
the LCD backlight turns off. You can also turn off the LCD backlight by pressing
Fn+F2.
To end screen blank mode and resume normal operation, press any key.
Shutting down the computer
If you are not going to use your computer for a long time, shut it down.
To shut down the computer, do the following:
• Windows 7:
Click Start → Shut down.
• Windows 8.1:
1.Open the charms bar, then select Settings
.
2.Select Power → Shut down.
Power management