Troubleshooting and support, Troubleshooting, The computer is unable to start up – HP Compaq Presario CQ56-110US Notebook PC User Manual
Page 66: The computer screen is blank, Appendix a troubleshooting and support, Atroubleshooting and support
A
Troubleshooting and support
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Troubleshooting
The following sections describe several common issues and solutions.
The computer is unable to start up
If the computer does not turn on when you press the power button, the following suggestions may help
you determine why the computer does not start up:
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If the computer is plugged into an AC outlet, plug another electrical device into the outlet to be sure
that the outlet is providing adequate power.
NOTE:
Use only the AC adapter provided with the computer or one approved by HP for this
computer.
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If the computer is plugged into an external power source other than an AC outlet, plug the computer
into an AC outlet using the AC adapter. Be sure that the power cord and AC adapter connections
are secure.
The computer screen is blank
If the screen is blank but you have not turned off the computer, one or more of these settings may be
the cause:
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The computer may be in the Suspend state or in Hibernation. To exit Suspend or Hibernation,
briefly press the power button. Suspend and Hibernation are energy-saving features that turn off
the display. Suspend and Hibernation can be initiated by the system while the computer is on but
is not in use, or when the computer has reached a low battery level. To change these and other
power settings, right-click the Power icon in the notification area at the far right of the taskbar, and
then click Preferences.
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The computer may not be set to display the image on the computer screen. To transfer the image
to the computer screen, press
f4
. On most models, when an optional external display, 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
f4
repeatedly, the image
alternates among the computer display, one or more external displays, and simultaneous display
on all devices.
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Appendix A Troubleshooting and support