Dell 23.8" OptiPlex 7410 All-in-One Desktop Computer (Gray) - Manual (Page 65)

Steps
With the positive-side (+) facing up, insert the coin-cell battery into the battery socket on the system board and snap the
battery into place.
Next steps
1. Install the system-board shield .
2. Install the back cover .
3. Install the stand .
4. Follow the procedure in After working inside your computer .
I/O cover
Removing the I/O cover
Prerequisites
1. Follow the procedure in Before working inside your computer .
2. Remove the stand .
3. Remove the back cover .
4. Remove the system-board shield .
About this task
The following image(s) indicate the location of the I/O cover and provides a visual representation of the removal procedure.
Removing and installing Customer Replaceable Units (CRUs) 65