Dell Studio 1555 (Early 2009) - Manual (Page 46)

9. Remove the Mini-Card from the system board (see Removing the Mini- Card ).
10. Remove the system board.
Replacing the System Board Assembly
Follow the steps in Removing the System Board Assembly in reverse order.
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NOTE: Depending on your system configuration, the number of screws shown here may be greater than the number of screws present on your
computer.
CAUTION: Ensure that any loose cables do not get caught beneath the system board.