Dell 23.8" OptiPlex 7410 All-in-One Desktop Computer (Gray) - Manual (Page 105)

Steps
To install the display-assembly base, perform all the post-requisite procedures.
Next steps
1. Install the power-button and I/O board .
2. Install the audio board .
3. Install the system board .
NOTE: The system board can be installed with the memory, solid-state drive(s), coin-cell battery, and processor
pre-attached.
4. Install the heat sink .
5. Install the speakers .
6. Install the I/O bracket .
7. Install the power-supply fan .
8. Install the power-supply unit .
9. Install the fan .
10. Install the retractable-camera assembly .
11. Install the bottom cover .
12. Install the I/O cover .
13. Install the wireless card .
14. Install the system-board shield .
15. Install the graphics card .
16. Install the back cover .
17. Install the stand .
18. Follow the procedure in After working inside your computer .
Removing and installing Field Replaceable Units (FRUs) 105