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2-16 Dell Dimension 900 System Reference and Troubleshooting Guide
11. Replace the riser-board bracket according to the instructions in “Removing and
Replacing the Riser-Board Bracket” found earlier in this chapter.
12. Replace the computer cover.
13. See the documentation that came with the expansion card for information on
installing any required drivers for your operating system.
Removing Expansion Cards
1. Remove the computer cover according to the instructions in “Removing and
Replacing the Computer Cover” found earlier in this chapter.
2. Remove the riser-board bracket according to the instructions in “Removing and
Replacing the Riser-Board Bracket” found earlier in this chapter.
3. If necessary, disconnect any cables connected to the card.
4. Remove the screw that secures the filler-bracket cap to the back panel of the
computer (see Figure 2-8), and remove the filler-bracket cap.
5. Remove the screw from the card-mounting bracket.
NOTICE: Use one hand to support the riser board while removing an
expansion card from an expansion-card connector. Otherwise, damage to
the riser-board connector or system board may occur.
6. Grasp the card by its top corners, and ease it out of its connector.
7. If you are removing the card permanently, install a metal filler bracket over the
empty card-slot opening in the bracket mount.
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.
8. Replace the filler-bracket cap and screw that you removed in step 4.
9. Replace the riser-board bracket according to the instructions in “Removing and
Replacing the Riser-Board Bracket” found earlier in this chapter.
10. Replace the computer cover, and reconnect your computer and devices to their
electrical outlets and turn them on.
Adding Memory
You can increase memory to a maximum of 512 megabytes (MB) by installing
combinations of 3.3-volt (V) 32-, 64-, 128-, and 256-MB dual in-line memory modules
(DIMMs) in the two DIMM sockets on the system board. This system supports only
non-error checking and correction (non-ECC), 100-megahertz (MHz) DIMMs. Purchas-
ing memory upgrades from Dell Spare Parts ensures system compatibility; these
upgrades are also covered under your system warranty.