GUID-67274E98-E2F1-4B7B-A903-F38BA6B62028Replacing the system boardWARNING: Before working inside your computer, read the safetyinformation that shipped with your computer and follow the steps in Beforeworking inside your computer. After working inside your computer, followthe instructions in After working inside your computer. For more safety bestpractices, see the Regulatory Compliance home page at www.dell.com/regulatory_compliance.NOTE: Your computer’s Service Tag is stored in the system board. You mustenter the Service Tag in the BIOS setup program after you replace thesystem board.NOTE: Replacing the system board removes any changes you have made tothe BIOS using the BIOS setup program. You must make the appropriatechanges again after you replace the system board.GUID-C2C7076B-49B1-458D-BA0D-8C0E802FE040ProcedureCAUTION: Make sure that no cables are placed under the system board.1 Slide the ports on the system board into the slots on the middle-frame base andplace the system board on the middle-frame base.2 Align the screw holes on the system board with the screw holes on the middle-frame base.3 Replace the five screws (M3x5) that secure the system board to the middle-frame base.4 Connect the display-backlight cable to the system board.5 Slide the control-buttons board and display cables into their connectors on thesystem board and close the latches to secure the cables.6 Connect the speaker, touch-screen board, hard-drive, optical-drive, hard-driveand optical-drive power, fan, and microphone and camera cables to the systemboard.74