HP LJ475UT manual Testing an AC adapter

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Testing an AC adapter

Test the AC adapter if the computer exhibits any of the following symptoms when it is connected to AC power:

●The computer does not turn on.

●The display does not turn on.

●The power light is off.

To test the AC adapter:

1.Shut down the computer.

2.Remove the battery from the computer.

3.Connect the AC adapter to the computer, and then plug it into an AC outlet.

4.Turn on the computer.

●If the power light turns on, the AC adapter is functioning properly.

●If the power light remains off, the AC adapter is not functioning and should be replaced. Contact technical support for information on obtaining a replacement AC power adapter.

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Contents HP Notebook User Guide Product notice Safety warning notice Iv Safety warning notice Table of contents VGA Drives Performing a system recovery Backing up your information Cleaning products Page Finding information WelcomeResources For information about Finding informationTop Getting to know your computerTouchPad Lights Buttons Control Center System Power ManagementFn key KeysEsc key Front Right Left Left Display Bottom Networking Using an Internet service provider ISP Turning wireless devices on and off Identifying wireless and network status iconsCreating a wireless connection Using a WlanSetting up a new Wlan Connecting to an existing WlanRoaming to another network Protecting your WlanConnecting a modem cable Using Bluetooth wireless devices select models onlyConnecting to a wired network Using a modem select models onlyConnecting a country- or region-specific modem cable adapter Connecting to a local area network LAN select models only Keyboard and pointing devices Using the keyboardIdentifying the hotkeys Using the keyboard Using the embedded numeric keypad Using keypadsTurning the embedded numeric keypad on and off Using the integrated numeric keypadUsing an optional external numeric keypad Using the TouchPadTurning the TouchPad off and on Navigating Using TouchPad gesturesSelecting Scrolling Setting pointing device preferencesPinching/Zooming Multimedia Using the media activity keysUsing the audio features Adjusting the volume Checking your audio functions Using the Webcam select models onlyVGA Using video devicesConnecting an Hdmi device select models only Configuring audio for Hdmi select models only Shutting down the computer Power managementInitiating and exiting Hibernation Setting power optionsUsing power-saving states Initiating and exiting SuspendViewing the current power management settings Using battery powerUsing the Power icon Using power managementDisplaying the remaining battery charge Inserting or removing the battery Charging a battery Managing low battery levels Maximizing battery lifeIdentifying low battery levels Storing a battery Conserving battery powerResolving a low battery level Disposing of a used battery Using external AC powerReplacing the battery Testing an AC adapter Handling drives DrivesRemoving the hard drive Replacing or upgrading the hard driveLift the hard drive 3 out of the hard drive bay Drives Installing a hard drive Page Removing an optical disc Using optical drives select models onlyIdentifying the installed optical drive Inserting an optical discWhen the disc tray opens normally Page External cards and devices Using Digital Media Slot cards select models onlyInserting a digital card Removing a digital card Configuring an ExpressCard Using ExpressCards select models onlyInserting an ExpressCard Removing an ExpressCard Using a USB deviceRemoving a USB device Connecting a USB deviceUsing optional external drives Using optional external devicesMemory modules Page Page Page Page Protecting the computer SecuritySetting passwords in the operating system Using passwordsSetting passwords in Computer Setup Entering an administrator password Managing an administrator passwordManaging a power-on password Entering a power-on password Using firewall softwareInstalling an optional security cable Performing a system recovery Backing up your information Backup and RecoveryPerforming a system recovery Backing up your information Navigating and selecting in Computer Setup Computer SetupStarting Computer Setup Using Computer SetupRestoring factory settings in Computer Setup Updating the BiosDownloading a Bios update Determining the Bios versionComputer screen is blank Troubleshooting and supportTroubleshooting Computer is unable to start upAn external device is not working Software is functioning abnormallyComputer is on but not responding Computer is unusually warmOptical disc tray does not open for removal of a CD or DVD Wireless network connection is not workingDisc does not play Computer does not detect the optical driveMovie is not visible on an external display Contacting customer support Component LabelsCleaning products Cleaning your computerInput power SpecificationsOperating environment Electrostatic discharge USB IndexJacks