Dell OpriPlex XE3 Service Manual page 38

2 Insert the VGA module into its slot from the inside of your computer [1] and connect the VGA cable to the connector on the system
board [2].
3 Replace the two (M3X3) screws to secure the optional VGA module to the system.
4 Install the system fan.
5 Close the front panel
6 Install the:
a Front bezel
b Side cover
38 Disassembly and reassembly
door.