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Chapter 4. Troubleshooting
29
The computer does not return
from sleep mode and the
computer does not work.
• If the computer does not return from sleep mode, it may
have entered hibernation mode automatically because the
battery is depleted. Check the power indicator.
• 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 your computer is in hibernation mode or powered-off,
connect the AC power adapter to the computer, then press
the Power button to resume operation.
Note: 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 five seconds or more. If the computer still does not reset, remove the AC
power adapter.
Display panel problems
The screen is blank. • Do the following:
- If you are using the AC power adapter or the battery, and
the battery status indicator is on, press F12 ( ) to
make the screen brighter.
- If the power indicator is blinking, press the Power button
to resume from 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 backlight of the
LCD screen has been turned off.
The screen is unreadable or
distorted.
• Make sure that:
- 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.
Sound problems
No sound can be heard from
the speaker even when the
volume is turned up.
• Make sure that:
- The Mute function is off.
- The combo audio jack is not being used.
- Speakers are selected as the playback device.