Dell 23.8" OptiPlex 7410 All-in-One Desktop Computer (Gray) - Manual (Page 91)

System board
Removing the system board
Prerequisites
1. Follow the procedure in Before working inside your computer .
2. Remove the stand .
3. Remove the back cover .
4. Remove the memory .
5. Remove the graphics card .
6. Remove the system-board shield .
7. Remove the I/O cover .
8. Remove the bottom cover .
9. Remove the I/O bracket .
10. Remove the M.2 2230 solid-state drive in M.2 slot 0 or the M.2 2280 solid-state drive in M.2 slot 0 , whichever applicable.
11. Remove the M.2 2230 solid-state drive in M.2 slot 1 or the M.2 2280 solid-state drive in M.2 slot 1 , whichever applicable.
12. Remove the wireless card .
13. Remove the heat sink .
14. Remove the processor .
About this task
NOTE: Replacing the system board removes any changes that you have made to the BIOS using the BIOS setup program.
Make the appropriate changes again after you replace the system board.
The following image indicates the connectors on your system-board.
Removing and installing Field Replaceable Units (FRUs) 91