Dell Dimension 3100C - Manual (Page 18)

Power Cable Connector
To connect a drive using the power cable, locate the power input connector on the system board.
Connecting and Disconnecting Drive Cables
When removing an IDE drive data cable, grasp the colored pull tab and pull until the connector detaches.
When connecting and disconnecting a serial ATA data cable, hold the cable by the black connector at each end.
Like IDE connectors, the serial ATA interface connectors are keyed for correct insertion; that is, a notch or a missing pin on one connector matches a tab or a
filled-in hole on the other connector.
CD/DVD Drive
Removing a DVD Drive
1. Follow the procedures in Before You Begin .
1 interface cable 2 interface connector
1 power cable 2 power input connector
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.
CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before removing the cover.
NOTICE: Do not pull the drive out of the computer by the drive cables. Doing so may cause damage to cables and the cable connectors.