Dell Dimension 2100 System Reference Manual page 60

To install a card:
1.
Remove the computer cover
2.
Rotate the power supply
3. Choose a system-board card connector for the card.
4. Unscrew and remove the metal filler bracket that covers the card-slot
opening for the card slot you intend to use.
5. Insert the card firmly into the system-board card connector.
Align the cutout on the bottom of the card connector with the crossbar in
the system-board card connector. Gently rock the card into the system-
board card connector until it is fully seated.
6. When the card is firmly seated in the system-board card connector,
secure the card-mounting bracket with the screw you removed in
To remove a card:
1.
Remove the computer cover
1 Card connector
2 Card
3 System-board card connector
4 Card mounting bracket and screw
.
.
.
.
step 4