Lenovo Yoga 13 Notebook IdeaPad - Manual (Page 35)

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