Lenovo G400s User Manual page 38

Chapter 4. Troubleshooting
The computer does not
return from sleep mode,
and the computer does not
work.
Display panel problems
The screen is blank.
The screen is unreadable or
distorted.
Incorrect characters appear
on the screen.
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• If your computer is in sleep mode, connect the AC
power adapter to the computer and then press any
key or the power button.
• If the system still does not return from sleep mode,
stops responding, or cannot be turned off, reset the
computer. Unsaved data may be lost. To reset the
computer, press and hold the power button for 4
seconds or more. If the computer is still not reset,
remove the AC power adapter and the battery.
• Do the following:
- If you are using the AC power adapter or the
- If the power indicator is blinking, press the power
- If the problem persists, follow the solution in the
- Press F9 (
• Make sure that:
- The display device driver is installed correctly.
- The screen resolution and color quality are correctly
- The monitor type is correct.
• Are the operating system or programs installed
correctly? If they are installed and configured
correctly, have the computer serviced.
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battery and the battery status indicator is on, press
F12 ( ) to make the screen brighter.
button to resume from sleep mode.
next problem "The screen is unreadable or
distorted."
) to confirm whether the backlight for
the LCD screen has been turned off.
set.