Follow the procedure in Before working inside your computer:
Save and close all open files and exit all open applications.
Shut down your computer.
Turn off all the attached peripherals.
Disconnect your computer and all attached devices from their electrical outlets.
Disconnect all attached network devices and peripherals, such as keyboard, mouse, and monitor from your computer.
Remove any media card and optical disc from your computer, if applicable.
Remove the side cover.
Removing the front bezel:
Gently pry and release the front-bezel tabs sequentially from the top.
Rotate the front bezel outward from the chassis and remove the front bezel.
Installing the front bezel:
Align the front-cover tabs with the slots on the chassis.
Rotate the front cover towards the chassis and snap it into place.
Install the side cover.
Follow the procedure in After working inside your computer:
Replace all screws and ensure that no stray screws remain inside your computer.
Connect any external devices, peripherals, or cables you removed before working on your computer.
Replace any media cards, discs, or any other components that you removed before working on your computer.
Connect your computer and all attached devices to their electrical outlets.
Turn on your computer.
