Dell Dimension C521 - Manual (Page 31)

5. Remove the memory. See Removing Memory .
Make a note of where each memory module(s) is installed so that you can reinstall the memory module(s) in the same connector.
6. Remove the processor and heat sink assembly. See Removing the Processor .
7. Remove the fan assemble. See Removing the Fan Assembly .
8. Disconnect all cables from the system board.
9. Remove the eight screws from the system board.
10. Slide the system board assembly toward the front of the computer, and then lift the board up and away.
Place the system board assembly that you just removed next to the replacement system board to ensure it is identical.
Replacing the System Board
1. Gently align the system board into the chassis and slide it toward the back of the computer.
2. Using the eight screws, secure the system board to the chassis.
3. Replace the fan assembly. See Installing the Fan Assembly .
4. Replace the processor. See Installing the Processor .
5. Replace the memory modules. See Installing Memory .
Ensure that you install the memory modules in the same connectors as noted in step 5 of Removing the System Board.
6. Replace any removed expansion cards. See Installing an Expansion Card .
7. Replace any other components and cables that you removed from the system board.
8. Replace the computer cover. See Replacing the Computer Cover .
9. Connect your computer and devices to electrical outlets, and turn them on.
10. Verify the computer is operational by running the Dell Diagnostics. See Dell Diagnostics .
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1 system board 2 screws (8)