Dell Dimension 9100 - Manual (Page 34)

9. Replace the computer cover .
10. Connect your computer and devices to electrical outlets, and turn them on.
I/O Panel
I/O-Panel Components
Removing the I/O Panel
1. Follow the procedures in " Before You Begin ."
2. Remove the computer cover .
3. If your computer includes a card retention mechanism to secure the x16 card in place from the top:
a. Pivot the mechanism upward and gently press the release tab downward to release the mechanism from the two tab slots holding it in place.
NOTICE: To connect a network cable, first plug the cable into the network port or device and then plug the cable into the computer.
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.
CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover.
1 USB ports
2 diagnostic, hard-drive activity, and network lights
3 headphones connector
4 microphone connector