Lenovo G460 Notebook - Manual (Page 37)

Chapter 5. Troubleshooting
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Sleep or hibernation problems
The critical low-battery error
message appears, and the
computer immediately turns off. • The battery power is getting low. Connect the AC adapter to the
computer, or replace the battery with a fully charged one.
The computer enters sleep mode
immediately after Power-on self-test
(POST). • Make sure that:
- The battery is charged.
- The operating temperature is within the acceptable range. See
“Appendix B. Use, and care information” on page 42.
Note: If the battery is charged and the temperature is within range, have the computer serviced.
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 adapter to the
computer, then press any key or the power button.
• If your computer is in hibernation mode or power-off state, connect
the AC 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 4 seconds or more. If the computer is still not reset, remove the AC adapter and the battery.
Computer screen problems
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 Fn + to make the screen
brighter.
- If the power indicator is in blinking, press the power button to
resume from the sleep mode.
- If the problem persist, follow the solution in the following problem
“The screen is unreadable or distorted.”
The screen is unreadable or
distorted. • Make sure that:
- The display device driver is installed correctly.
- The screen resolution and color quality are correctly set.
- The monitor type is correct.
Incorrect characters appear on the
screen. • Did you install the operating system or application program
correctly? If they are installed and configured correctly, have the
computer serviced.
A message, “Unable to create
overlay window,” appears when you
try to start DVD playback.
-or-
You get poor or no playback of
video, DVD or game applications. • Do either of the following:
- If you are using 32-bit color mode, change the color depth to 16-bit
mode.
- If you are using a desktop resolution over the optimum, reduce the
display resolution and the color depth.