Dell 23.8" OptiPlex 7410 All-in-One Desktop Computer (Gray) - Manual (Page 53)

Steps
1. Connect the antenna cables to the wireless card.
Table 24. Antenna-cable color scheme
Connectors on the
wireless card
Antenna-cable color Silkscreen marking
Main White MAIN △ (white triangle)
Auxiliary Black AUX ▲ (black triangle)
2. Place the wireless-card bracket on the wireless card.
3. Align the notch on the wireless card with the tab on the wireless-card slot (M.2 WLAN).
4. Slide the wireless card at an angle into the wireless-card slot (M.2 WLAN).
5. Replace the screw (M2x3.5) that secures the wireless-card bracket to the wireless card.
Next steps
1. Install the system-board shield .
2. Install the back cover .
3. Install the stand .
Removing and installing Customer Replaceable Units (CRUs) 53