Lenovo 3126, 3120, 3122, 3128 Installing or replacing a memory module, Removing a memory module

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6.Pivot the optical drive bay upward to access the system board components and the cables. See “Replacing the optical drive” on page 30.

Installing or replacing a memory module

Attention:

Do not open your computer or attempt any repair before reading and understanding the “Important safety information” in the ThinkCentre Safety and Warranty Guide that came with your computer. To obtain a copy of the ThinkCentre Safety and Warranty Guide, go to:

http://www.lenovo.com/support

This section provides instructions on how to install or replace a memory module.

Your computer has four slots for installing or replacing DDR3 DIMMs that provide up to a maximum of 16 GB system memory. When installing or replacing a memory module, use 1 GB, 2 GB, or 4 GB DDR3 DIMMs in any combination up to a maximum of 16 GB.

To install or replace a memory module, do the following:

1.Turn off the computer and disconnect all power cords from electrical outlets.

2.Open the computer cover. See “Opening the computer cover” on page 14.

3.Remove the front bezel. See “Removing and reinstalling the front bezel” on page 15.

4.Remove the heat sink fan duct. See “Replacing the heat sink and fan assembly” on page 33.

5.Remove the hard disk drive. See “Replacing the hard disk drive” on page 27.

6.Pivot the optical drive bay upward to gain access to the memory slots. See “Replacing the optical drive” on page 30.

7.Locate the memory slots. See “Locating parts on the system board” on page 10.

8.Remove any parts that might prevent access to the memory slots.

9.Depending on whether you are installing or replacing a memory module, do one of the following:

If you are replacing an old memory module, open the retaining clips and gently pull the memory module out of the memory slot.

Figure 9. Removing a memory module

Chapter 2. Installing or replacing hardware 17

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Contents ThinkCentre User Guide Second Edition December Copyright Lenovo Contents Index Important safety information Iv ThinkCentre User Guide Product overview FeaturesConnectivity Preinstalled operating system Software provided with your Windows operating system SpecificationsSoftware overview Lenovo ThinkVantage Tools Locations Lenovo Solution CenterFront connector, control, and indicator locations Locating connectors and parts on the rear of your computerConnector Description If you use speech-recognition software Locating parts on the system board Locating componentsSystem board part locations Locating internal drivesDrive bay locations Handling static-sensitive devices Installing or replacing hardwareInstalling or replacing hardware Opening the computer cover Installing external optionsRemoving the front bezel Removing and reinstalling the front bezelWhat to do next Accessing the system board components and drivesRemoving a memory module Installing or replacing a memory moduleOpening the retaining clips Installing or replacing a PCI cardRemoving a PCI card Installing the PCI card Installing the card reader Installing or replacing the card readerInstalling the card reader Installing the screw that secures the card reader Replacing the card reader Installing the card reader Replacing the battery Replacing the hard disk drive Removing the old batteryRemoving the hard disk drive Removing the hard disk drive from the bracket Replacing the optical drive Installing the hard disk drivePivoting the optical drive bay Removing the old optical drive Installing a new optical drive Replacing the heat sink and fan assemblyScrews that secure the heat sink and fan assembly Removing the heat sink fan duct Installing the heat sink fan duct Replacing the power supply assemblyInstalling or replacing hardware Removing the heat sink fan duct Power connectors on the system board Installing the power supply assembly Replacing the microprocessor Accessing the microprocessor Installing or replacing hardware Replacing the internal speaker Removing the front bezel Removing the cover presence switch Removing the internal speaker Installing the new internal speaker Reinstalling the cover presence switch Replacing the front audio and USB assemblyRemoving the front audio and USB assembly Replacing the mouse Replacing the keyboardMouse connectors Completing the parts replacementIntegrated cable lock Obtaining device drivers Basic security featuresPassword protection Erasing a lost or forgotten password clearing Cmos Creating recovery media Recovery informationCreating and using recovery media Performing a backup operation Using recovery mediaPerforming backup and recovery operations Using the Rescue and Recovery workspace Performing a recovery operationCreating a rescue medium Creating and using a rescue mediumUsing a rescue medium Solving recovery problems Installing or reinstalling device driversThinkCentre User Guide Using passwords Using the Setup Utility programStarting the Setup Utility program Viewing or changing settingsSetting, changing, or deleting a password Password considerationsPower-on password Administrator passwordViewing or changing the startup device sequence Selecting a startup deviceSelecting a temporary startup device Exiting the Setup Utility program Updating system programs Using system programsUpdating flashing the Bios from a disc Recovering from a Post and Bios update failure Updating flashing the Bios from your operating systemUpdating system programs ThinkCentre User Guide Basic troubleshooting Troubleshooting and diagnostic programsLenovo Solution Center Diagnostic programsPC-Doctor for DOS Lenovo ThinkVantage ToolboxNon-optical mouse Cleaning the mouseOptical mouse Troubleshooting and diagnostic programs ThinkCentre User Guide Lenovo ThinkVantage Tools Getting information, help, and serviceInformation resources Online Books folderLenovo Support Web site Access HelpSafety and warranty Lenovo WelcomeCalling for service Help and serviceUsing the documentation and diagnostic programs Purchasing additional services Using other servicesAppendix A. Notices Television output notice Trademarks ThinkCentre User Guide CRU IndexInstalling options Memory module PCI card Security features Set Power-On Password ThinkCentre User Guide Page 0A94223