Dell Precision 410 Service Manual page 82

If you are replacing a system board, remove the DIMMs, the primary micro-
processor SEC cartridge/heat sink assembly, and the terminator card or
secondary microprocessor assembly, and install them on the replacement
board.
When you reinstall the system board, before you slide the system board back
to lock it in position, push down near each slot to engage the grounding clip
onto its corresponding tab. Push evenly on both sides of the system board as
you slide it into position (do not twist the system board).
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