Dell OptiPlex 7050 Micro Owner's Manual page 25

4. To remove the system board:
a. Remove the #6-32*5.4 screws that secure the system board to the computer [1].
b. Slide the system board to disengage the connectors from the back of the computer [2].
c. Lift the system board away from the computer [3].
Disassembly and reassembly 25