Dell Dimension 1100/B110 - Manual (Page 32)

2. Remove the computer cover .
3. Release and remove the front panel:
a. If your computer has a release lever, push the release lever to release the top tab.
b. Reach inside the computer and push the top and bottom tab towards you to release them.
c. Rotate the front panel to separate it from the side hinges.
Removing the Front-Panel Insert
1. Press in the two insert tabs.