User's Manual

Troubleshooting
Quick Reference 3–3
The suggestions below may help you determine the reason the
computer screen is blank.
■ To exit Sleep or Hibernation, briefly press the power button.
Sleep and Hibernation are energy-saving features that can turn
off the display. Sleep and Hibernation can be initiated by the
system while the computer is in Windows but is not in use, or
when the computer has reached a low-battery condition. To
change these and other power settings, select
Start > Control
Panel > System and Maintenance > Power Options
.
■ 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.
Software is functioning abnormally
If the software becomes unresponsive or responds abnormally,
follow these suggestions:
■ Restart the computer:
a. Click Start.
b. Click the arrow next to the Lock button, and then click
Restart.
If you cannot restart the computer using this procedure, refer
to the next section, “The computer is turned on but not
responding.”
■ Run a virus scan. For information about using the antivirus
resources on the computer, refer to “Protecting the computer
from viruses” in Chapter 2.