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The computer does not

return from sleep mode

and the computer does

not work.

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 about ten seconds or more. If the computer

still does not turn off, remove the AC power adapter.

Display panel problems

The screen is blank.

The screen is unreadable

or distorted.

Incorrect characters

appear on the screen.

• 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 Power button.

• If your computer is powered‐off, connect the AC power

adapter to the computer. Then press the Power button to

resume operation.

• Do the following:

‐ If you are using the AC power adapter or the battery, press 

Fn + (located on the keyboard) 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."

• Make sure that the screen resolution and color quality are

correctly set.

• Is the operating system or programs installed correctly?

If they are installed and configured correctly, do the following:

Press the Power button for about three seconds to turn on

the computer.

Press and hold the Power button for about ten seconds to

force shut down.

Press the Power button for about three seconds again to

restart. Then reset the computer with the Reset this PC

recovery system.

If the problem persists, have the computer serviced.

Chapter 4. Troubleshooting