Lenovo YOGA 900 User Manual page 22

Chapter 3. 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.
Sound problems
No sound can be heard
from the speakers even
when the volume is
turned up.
•
If your computer is in sleep mode, connect the AC power
adapter to the computer, then press the Windows button 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 eight seconds or more. If the
computer is still not reset, remove the AC power adapter.
•
Do the following:
- If you are using the AC power adapter or the battery pack,
and the battery status indicator is on, press F12 (
make the screen brighter.
- If the power indicator is blinking, press the Power button to
resume from sleep mode.
- Press F9 (
LCD screen has been turned off.
- If the problem persists, follow the solution in the next
problem "The screen is unreadable or distorted."
•
Make sure that:
- The screen resolution and color quality are correctly set.
- The monitor type is correct.
•
Is the operating system or programs installed correctly? If
they are installed and configured correctly, have the
computer serviced.
•
Make sure that:
- The Mute function is off.
- The combo audio jack is not being used.
- Speakers are selected as the playback device.
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) to confirm whether the backlight of the
) to