Testing an AC adapter | HP LJ475UT manual

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.

Using external AC power 45

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HP LJ475UT manual Testing an AC adapter

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 Welcome Resources For information about Finding information Top Getting to know your computerTouchPad Lights Buttons Control Center System Power Management Fn key Keys Esc 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 Wlan Setting up a new Wlan Connecting to an existing Wlan Roaming to another network Protecting your Wlan Connecting a modem cable Using Bluetooth wireless devices select models onlyConnecting to a wired network Using a modem select models only Connecting 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 keypads Turning the embedded numeric keypad on and off Using the integrated numeric keypad Using 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 keys Using the audio features Adjusting the volume Checking your audio functions Using the Webcam select models only VGA Using video devices Connecting an Hdmi device select models only Configuring audio for Hdmi select models only Shutting down the computer Power management Initiating and exiting Hibernation Setting power optionsUsing power-saving states Initiating and exiting Suspend Viewing the current power management settings Using battery powerUsing the Power icon Using power management Displaying 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 Drives Removing the hard drive Replacing or upgrading the hard drive Lift 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 disc When 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 only Inserting an ExpressCard Removing an ExpressCard Using a USB device Removing a USB device Connecting a USB device Using optional external drives Using optional external devices Memory modules Page Page Page Page Protecting the computer Security Setting 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 software Installing an optional security cable Performing a system recovery Backing up your information Backup and Recovery Performing a system recovery Backing up your information Navigating and selecting in Computer Setup Computer SetupStarting Computer Setup Using Computer Setup Restoring factory settings in Computer Setup Updating the Bios Downloading a Bios update Determining the Bios version Computer screen is blank Troubleshooting and supportTroubleshooting Computer is unable to start up An external device is not working Software is functioning abnormallyComputer is on but not responding Computer is unusually warm Optical disc tray does not open for removal of a CD or DVD Wireless network connection is not working Disc does not play Computer does not detect the optical driveMovie is not visible on an external display Contacting customer support Component Labels Cleaning products Cleaning your computer Input power Specifications Operating environment Electrostatic discharge USB Index Jacks