Dell Dimension 5100C - Manual (Page 26)

4. Remove the existing modem:
a. Disconnect the modem cable from the modem.
b. Use a small Phillips screwdriver to remove the two screws that secure the modem to the system board, and set the screws aside.
c. Pull straight up on the attached pull-tab to lift the modem out of its connector on the system board.
5. Install the new modem:
a. Align the modem with the screw holes and press the modem into the connector on the system board.
b. Connect the modem cable to the modem.
c. Use a Phillips screwdriver to replace and tighten the two screws that secure the modem to the system board.
6. Replace the computer cover .
Replacing the External Modem Connector
1. Follow the procedures in " Before You Begin ."
2. Remove the computer cover .
3. Remove the existing modem .
4. Remove the modem cable from the modem.
5. Remove the external modem connector:
a. Remove the screw that secures the external modem connector.
b. Slide the external modem connector away from the slot that holds the modem connector in place.
c. Lift the modem cable and connector from the computer.
NOTE: For easier access to the modem, it may be necessary to remove the power cable from the power connector on the system board.
NOTICE: The connectors are keyed to ensure correct insertion. If you feel resistance, check the connectors and realign the card.
NOTE: Note the routing of the modem cable as you remove the modem. You must route the cable properly when you replace the modem to prevent the
cable from being pinched or crimped.