HP CQ56-154CA, CQ56-110US, CQ56-100XX Troubleshooting and support, Computer is unable to start up

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A Troubleshooting and support

●Troubleshooting

●Contacting customer support

●Labels

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:

●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.

●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:

●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.

●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.

58 Appendix A Troubleshooting and support

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Contents HP Notebook User Guide Product notice Safety warning notice Iv Safety warning notice Table of contents Multimedia Memory modules Security Appendix B Routine care Welcome Finding informationWelcome Getting to know your computer Top TouchPadLights Top Button and speakers Keys Right side Left side Display Wireless antennas Bottom Additional hardware Networking Using an Internet service provider ISP Using a Wlan Identifying wireless and network status iconsCreating a wireless connection Turning wireless devices on and offConnecting to an existing Wlan Setting up a new WlanProtecting your Wlan Roaming to another networkUsing Bluetooth wireless devices select models only Connecting to a local area network LANPage Using the keyboard Pointing devices and keyboardFunction Action key Using the TouchPad Setting pointing device preferencesUsing the media activity controls MultimediaAudio Adjusting the volume Webcam select models onlyChecking your audio functions Video VGAPower management Shutting down the computerSetting power options Using power-saving statesUsing battery power Using the Power iconUsing power management Displaying the remaining battery charge Inserting or removing the battery Charging a battery Maximizing battery life Managing low battery levelsConserving battery power Storing a batteryUsing external AC power Disposing of a used batteryReplacing the battery Testing an AC adapter Drives Handling drivesReplacing or upgrading the hard drive Removing the hard driveInstalling the hard drive Page Playing a CD Using optical drives select models onlyIdentifying the installed optical drive Removing a CDPage Using a USB device Connecting a USB deviceExternal devices Using a USB device Using optional external devices Using optional external drivesRemoving a USB device Memory modules Page Page Page Using passwords SecurityProtecting the computer Setting passwords in the operating system Operating system passwords FunctionBackup and Recovery Performing a system recovery Backing up your information Using Setup Utility Setup Utility BiosStarting Setup Utility Changing the language of Setup UtilityRestoring factory default settings in Setup Utility Exiting Setup UtilityDisplaying system information Computer is unable to start up Troubleshooting and supportTroubleshooting Computer screen is blankComputer is unusually warm Software is functioning abnormallyComputer is on but not responding An external device is not workingWireless network connection is not working Optical disc tray does not open for removal of a CDComputer does not detect the optical drive Disc does not playMovie is not visible on an external display Contacting customer support Labels ComponentRoutine care Cleaning the display Cleaning the TouchPad and keyboard Specifications Input powerOperating environment Appendix C Specifications Electrostatic discharge Index LAN USBWlan

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