The computer screen is blank.
If you have not turned off the computer but the screen is blank, one or more of the following may be the cause:
●The computer may be in standby or hibernation.
●The computer may not be set to display the image on the computer screen.
●The display switch or the ambient light sensor (select models only) may not be functioning properly. The suggestions below may help you determine the reason the computer screen is blank.
●To resume from standby or restore from hibernation, briefly press the power button.
Standby and hibernation are
●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 simultaneously displays on all devices.
●If the computer has an external display switch, press it to confirm that it moves freely. (The display switch is normally located on the
●If the computer has an ambient light sensor (select models only), make sure that the sensor is not obstructed.
The ambient light sensor is normally located on the
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