The computer screen is blank

If the computer screen is blank but you have not turned off the computer, one or more of these settings may be the cause:

●The computer may be in the Sleep state.

To exit Sleep, briefly press the power button.

Sleep is an energy-saving feature that turns off the display. Sleep can be initiated by the system while the computer is on but not in use, or when the computer has reached a low battery level.

To change these and other power settings:

1.Click Start, and then click Control Panel.

2.Click Power Options.

●The computer may not be set to display the image on the computer screen. To transfer the image to the computer screen, press fn+f4.

On most models, when an optional external display device, such as a monitor, is connected to the computer, the image can be displayed on the computer screen or the external display, or on both devices simultaneously. When you press fn+f4 repeatedly, the image alternates among the computer display, one or more external display devices, and simultaneous display on all devices.

The computer is on but is not responding

If the computer is on but is not responding to software or keyboard commands, turn off the computer by using the standard shutdown procedure:

1.Save your work and close all programs.

2.Click Start, and then click Shut down.

If you are unable to turn off the computer with these steps, try the following emergency shutdown procedures, in the sequence provided, until shutdown occurs:

CAUTION: Emergency shutdown procedures result in the loss of unsaved information.

●Press and hold the power button for at least 5 seconds.

●Disconnect the computer from external power and remove the battery.

68 Chapter 17 Troubleshooting