Lenovo 59RF0049, U510, 4941XF2 manual Display panel problems, Work

Chapter 4. Troubleshooting

The computer does not	• If your computer is in sleep mode, connect the AC
return from sleep mode and	adapter to the computer, then press any key or the
the computer does not	power button.
work.	• 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 still does not reset, remove the AC adapter.

Display panel 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
	F12 (	) to make the screen brighter.
	- If the power indicator is blinking, 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.”
	- Press F9 (		) to confirm whether the LCD screen
	has been turned off.

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	• Are the operating system or programs installed
on the screen.	correctly? If they are installed and configured
	correctly, have the computer serviced.

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