19
Sleep problems
The critical low-battery
error message appears,
and the computer turns off
• The battery power is getting low. Connect the AC adapter to the computer.
The computer enters
sleep mode immediately
after Power-on.
• Make sure that the battery is charged.
- The operating temperature may be too hot. Move to a cooler environment and try to wake the computer.
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 the key button
or the power button.
• If your computer is powered-off, connect the AC adapter to the computer, then press the power button to
resume operation.
Display problem
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 F6
(do not need to press Fn) to make the screen brighter.
- 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.”
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
• Make sure that:
- The Mute function is off.
when the volume is
turned up.
- The combo audio jack is not being used.
- Speakers are selected as the playback device.
Other problems
Your computer does not
respond.
• To turn off your computer, press and hold the power button for 4 seconds or more. If the computer
still does not respond, remove the AC adapter.
• Your computer might lock when it enters sleep mode during a communication operation. Disable the
sleep timer when you are working on the network.
The connected external
device does not work.
• Do not connect or disconnect any external device cables other than USB while the computer power is on.
Otherwise, you might damage your computer.
• When using a high power consumption external device such as an external USB optical disk drive, use an
external device power adapter. Otherwise, the device may not be recognized.