Dell OptiPlex Small Form Factor 7010 Owner's Manual page 100

Steps
1. Align and lower the system board into the system until the stand-off points at the back of the system board align with those
on the chassis.
2. Replace the seven (#6-32) screws to secure the system board to the chassis.
3. Route and connect all the cables that you disconnected from the system board.
100 Retrait et installation des unités remplaçables sur site (FRU)