User guide

Chapter 4. Troubleshooting
25
The computer does not
return from sleep mode and
the computer does not work.
•If the computer does not return from sleep mode, it might be
because the battery is depleted.
•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 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; force shut down the computer (Unsaved data may be lost). To force shut down the
computer, press and hold the Power button for seven seconds or more. If the computer still does not turn
off, 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, press
F12 ( ) to make the screen brighter.
- Press the Power button to confirm if the computer is in
sleep mode.
-If the problem persists, follow the solution in the next
problem “The screen is unreadable or distorted.”
The screen is unreadable or
distorted.
• Make sure that the screen resolution and color qu
ality are
correctly set.
Incorrect characters appear
on the screen.
•Is the operating system or programs installed correctly?
If they are installed and configured correctly, do the following:
1 Press the Power button for three seconds to turn on the
computer.
2 Press and hold the Power button for seven seconds to
force shut down.
3 Press the Power button for three seconds to restart. Then
reset the computer with the Pus
h-button reset recovery
system.
If the problem persists, 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.