Dell OptiPlex GX50 Systems Service Manual page 24

1 Metal hooks (2)
To help replace the plastic computer cover, remove the accent door and front mask from the plastic computer cover:
a. Remove the front mask by releasing the tabs on the inside of the plastic computer cover.
b. Remove the accent door by pressing the middle of the door while lifting away the sides of the door.
c. After replacing the plastic computer cover, snap the front mask and accent door into place.
Removing the Front Mask and Accent Door—Small Form-Factor Computer