Lenovo 3269, 3026, 3039, 5548, 5536, 5391 Removing the retaining screws for the power supply assembly

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Figure 21. Removing the retaining screws for the power supply assembly

4.Open the computer cover. See “Opening the computer cover” on page 12.

5.Pivot the optical drive bay assembly upward to gain access to the power supply assembly. See “Accessing the system board components and drives” on page 12.

6.Disconnect the power supply assembly cables from all drives and from the power connectors 1 and on the system board.

Note: You might need to remove the hard disk drive to gain easy access to the power connector 2 . See “Replacing the hard disk drive” on page 18.

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Figure 22. Power connectors on the system board

Chapter 2. Installing or replacing hardware 23

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Contents ThinkCentre User Guide Page ThinkCentre User Guide First Edition October Copyright Lenovo Contents Appendix A. Notices Important safety information Viii ThinkCentre User Guide Product overview FeaturesPower supply Preinstalled software programs SpecificationsSoftware provided by Lenovo Software overviewThinkVantage Productivity Center Adobe Reader Locations Locating connectors on the front of your computerAntivirus software Connector Description Locating connectors on the rear of your computerComponent locations Locating componentsSystem board part locations Locating parts on the system boardDrive bay locations Locating internal drivesHandling static-sensitive devices Installing or replacing hardwareInstalling or replacing hardware Installing external optionsOpening the computer cover Accessing the system board components and drivesPivoting the optical drive bay assembly Installing or replacing a memory moduleOpening the retaining clips What to do next Installing or replacing a PCI cardRemoving a PCI card Installing the PCI card Replacing the batteryReplacing the hard disk drive Removing the old batteryRemoving the hard disk drive Replacing the optical drive Installing the hard disk driveRemoving the old optical drive Installing a new optical drive Replacing the power supply assemblyRemoving the retaining screws for the power supply assembly Replacing the heat sink Removing the power supply assemblyRemoving the heat sink Replacing the front audio and USB assembly Removing the front bezel Replacing the system fanRemoving the system fan Replacing the internal speakerRemoving the front bezel Removing the internal speaker Replacing the keyboard or mouse Installing the new internal speakerConnecting a new keyboard or mouse Completing the parts replacementIntegrated cable lock Installing security featuresErasing lost or forgotten passwords clearing Cmos Password protectionCreating and using recovery media Recovery informationCreating recovery media Performing backup and recovery operations Using recovery mediaPerforming a backup operation Using the Rescue and Recovery workspace Performing a recovery operationCreating a rescue medium Creating and using a rescue mediumInstalling or reinstalling device drivers Using a rescue mediumSolving recovery problems Using passwords Using the Setup UtilityStarting the Setup Utility program Viewing and changing settingsSetting, changing, and deleting a password Power-On PasswordAdministrator Password Hard Disk PasswordSelecting or changing the startup device sequence Exiting from the Setup Utility programSelecting a startup device Selecting a temporary startup deviceThinkCentre User Guide Updating flashing the Bios from a disc Using system programsUpdating system programs Recovering from a POST/BIOS update failure Updating flashing the Bios from your operating systemBasic troubleshooting Troubleshooting and diagnosticsLenovo ThinkVantage Toolbox Diagnostic programsPC-Doctor for DOS PC-Doctor for Rescue and RecoveryCleaning an optical mouse Lenovo ThinkVantage Tools Getting information, help, and serviceInformation resources Online Books folderSafety and Warranty Access HelpLenovo Welcome Using the documentation and diagnostic programs Help and serviceCalling for service Purchasing additional services Using other servicesAppendix A. Notices European conformance CE mark Trademarks Television output noticeCRU IndexRescue and Recovery workspace Page ThinkCentre User Guide Page 71Y7175