Chapter 5. Troubleshooting

The computer does not return

If the computer does not return from sleep mode, it may

from sleep mode and the com-

have entered hibernation mode automatically because the

puter does not work.

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.”

 

 

- Press Fn + F2 to confirm whether the LCD screen has been

 

 

turned off.

The screen is unreadable or

Make sure that:

distorted.

 

- 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

Did you install the operating system or programs correctly?

the screen.

 

If they are installed and configured correctly, have the

 

 

computer serviced.

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Lenovo Z470, Z370, Z570 manual Computer screen problems, Puter does not work