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Replacing the System Board

Dell™ Optiplex™ 740 Systems
User's Guide

Removing the System Board: Mini Tower, Desktop, and Small Form Factor Computers

1. Follow the procedures in Before You Begin.
   
   

NOTICE: Before touching anything inside your computer, ground yourself by touching an unpainted metal surface, such as the metal at the back of the computer. While you work, periodically touch an unpainted metal surface to dissipate any static electricity that could harm internal components.

2. Remove any components that restrict access to the system board such as: the (optical drive(s), floppy drive, hard drive, and I/O panel (as applicable).
   
   
3. Remove the processor and heat sink assembly:
   
   
   • Mini Tower: see Processor
     
     
   • Desktop: see Processor
     
     
   • Small Form Factor: see Processor
     
     
4. Disconnect all cables from the system board.
   
   
5. Remove the screws from the system board.
   
   
   • Mini Tower System Board Screws
     
     
   • Desktop System Board Screws
     
     
   • Small Form Factor System Board Screws
     
     
6. Slide the system board assembly toward the front of the computer, and then lift the board up and away.
   
   

Mini Tower System Board Screws

1

mini tower system board

2

screws (8)

Desktop System Board Screws

1

desktop system board

2

screws (8)

Small Form Factor System Board Screws

1

small form factor system board

2

screws (6)

Place the system board assembly that you just removed next to the replacement system board to ensure it is identical.

Replacing the System Board: Mini Tower, Desktop, and Small Form Factor Computers

1. Gently align the board into the chassis and slide it toward the back of the computer.
   
   
2. Using the screws, secure the system board to the chassis.
   
   
3. Replace any components and cables that you removed from the system board.
   
   
4. Reconnect all cables to their connectors at the back of the computer.
   
   
5. Replace the computer cover (see Replacing the Computer Cover).
   
   

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