Dell 23.8" OptiPlex 7410 All-in-One Desktop Computer (Gray) - Manual (Page 66)

Steps
1. Remove the two screws (M3x5) that secure the I/O cover to the display-assembly base.
2. Lift the I/O cover off the display-assembly base.
Installing the I/O cover
Prerequisites
If you are replacing a component, remove the existing component before performing the installation process.
About this task
The following image(s) indicate the location of the I/O cover and provides a visual representation of the installation procedure.
66 Removing and installing Customer Replaceable Units (CRUs)