Dell Latitude D620 - Manual (Page 38)

2. Insert the battery into the battery bay. See Before Working Inside Your Computer .
3. Connect the AC adapter to the computer and to an electrical outlet.
4. Turn on the computer.
5. Insert the CD that accompanied the replacement system board into the appropriate drive. Follow the instructions on the screen.
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NOTICE: Before turning on the computer, replace all screws and ensure that no stray screws remain inside the computer. Failure to do so may result in
damage to the computer.
NOTE: After replacing the system board, enter the computer Service Tag into the BIOS of the replacement system board.