Dell Dimension 2300 - Manual (Page 75)

Adding Parts 75
5 Release and remove the front panel:
a Push the release lever to release the top tab.
b Reach inside the computer and push the bottom tab towards you
to release it (the middle tab releases automatically).
c Rotate the front panel to separate it from the side hinges.
top tab
front panel
release lever
middle tab
bottom tab
side hinges (3)