Dell OptiPlex GX1 Service Manual page 156

system board
back of computer
screw
slots (5)
tabs (5)
To remove the system board, follow these steps:
NOTES: If you are replacing a system board, remove the microprocessor/heat
sink assembly, video-memory upgrade module (if present), and the DIMMs
from the old system board and install them on the replacement board.
Also, if the original system board has a NIC connector, ensure that the replace-
ment system board has a NIC connector.
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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