Dell OptiPlex 7070 Service Manual page 62

7. To remove the screws from the system board:
a. Remove the 5 screws that secure the system board to the chassis [1].
b. Remove the single screw used as a mounting point for M.2 SSD drive [2] and the standoff single (#6-32) screw [3] that
secures the system board to the system [3].
62 Removing and installing components