Dell Dimension 4100 - Manual (Page 43)

Adding Parts 43
5 Face the front of the computer. Use your thumbs to press in both
latches while pushing the cover backward. Move the cover back
slightly, and then lift it straight up.
If necessary, use both hands and work one side at a time.
Looking Inside Your Computer
CAUTION: Before you begin any of the procedures in this section,
follow the safety instructions on page 7.
fan system board
hard drive
filler brackets for
empty card slots
drive cage
drive cable
power cables power supply
bracket for second
hard drive