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The screen is blank.
If the AC adapter is connected, or if the battery is used, and the battery status indicator is on, press
F6 to make the screen brighter.
Press the power button to resume from sleep mode.
If the problem persists, check if the screen resolution and color are correctly set, or of the monitor
type is correct.
9.3. Sleep problems
The critical low-battery error message appears, and the device turns off.
The battery power is getting low. Connect the AC adapter to the device.
The device enters sleep mode immediately after Power-on.
Make sure that the battery is charged. The operating temperature may also be too hot. Move it to
a cooler environment and try to wake the device.
The device does not return from sleep mode and the device does not work.
Connect the AC adapter, then press the power button. If your device is powered-off, connect the
AC adapter first, and then press the power button to resume operation.
9.4. 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.
9.5. Other problems
Your device does not respond.
To turn off your device, press and hold the power button for 6 seconds or more. If the device still
does not respond, remove the AC adapter.
Your device 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 device power is
on. Otherwise, you might damage your device.
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, or the system
may shut down as a result.
