Dell Inspiron 3670 Service Manual page 57

3 Replace the eight screws (#6-32x6.35) that secure the system board to the chassis.
4 Replace the screw (#6-32x4.8, standoff) that secures the system board to the chassis.
5 Slide the front-I/O bracket into the front-I/O slot, aligning the screw hole on the front-I/O board to the screw hole on the chassis.
6 Replace the screw (#6-32x6.35) that secures the front-I/O bracket to the chassis.
Replacing the system board 57