Dell Dimension 2100 System Reference Manual page 21

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.
2. Rotate the power supply.
3. Disconnect any cables connected to the card.
4. Remove the screw from the card-mounting bracket.
5. Grasp the card by its top corners, and ease it out of its system-board card connector.
6. If you are removing the card permanently, install a metal filler bracket over the empty card-slot opening in the computer.
NOTE: Installing filler brackets over empty card-slot openings is necessary to maintain Federal Communications Commission (FCC)
certification of the system. The brackets also keep dust and dirt out of your computer.
Memory
To install a memory module:
1. Remove the computer cover.
1 Card connector
2 Card
3 System-board card connector
4 Card mounting bracket and screw
1 Cutouts (2)
2 Connector
3 Memory module
4 Notches (2)
5 Securing clips (2)
step 4.