Dell Embedded Box PC 5000 Service Manual page 107

2 Remove the screws that secure the system board to the chassis.
1 chassis
3 STDF(L8) HEX, M3x4 screws
(5)
5 M3x5 screws (8)
2 system board
4 STDF(L15) HEX, M3x4
screws (1)
107