Dell Latitude D520 - Manual (Page 41)

Replacing the System Board Assembly
1. Perform all of the steps in Removing the System Board Assembly in reverse order.
2. Turn on the computer.
3. Insert the flash BIOS update program CD that accompanied the replacement system board into the optical drive. Follow the instructions that appear on
the screen. See
Flashing the BIOS for further information.
4. Enter the system setup program to update the BIOS on the new system board with the computer Service Tag.
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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: If you use a BIOS update program CD to flash the BIOS, press <F12> before inserting the CD so that you can set up the computer to boot from a
CD this one time only. Otherwise, you must enter the system setup program to change the default boot order.