Dell GX280DT User Guide - Page 208

2 interface cable Most 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. Keyed connectors ensure that the pin-1 wire in the cable goes to the pin-1 end of the connector. The pin-1 end of a connector on a board or a card is usually indicated by a silk-screened "1" printed directly on the board or card. Power Cable Connector 1 power cable 2 power input connector 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. Hard Drive 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. NOTICE: To avoid damage to the drive, do not set it on a hard surface. Instead, set the drive on a surface, such as a foam pad, that will sufficiently cushion it. 1. If you are replacing a hard drive that contains data you want to keep, back up your files before you begin this procedure. 2. Check the documentation for the drive to verify that it is configured for your computer. 3. Follow the procedures in "Before You Begin." Removing a Hard Drive 1. Disconnect the power cable and hard-drive cable from the drive.