Dell Precision 650 - Manual (Page 52)

4. Disconnect any telephone or telecommunication lines from the computer.
5. Disconnect your computer and all attached devices from electrical outlets, and then press the power button to ground the system board.
6. If you have installed a padlock through the padlock ring on the back panel, remove the padlock.
7. Open the computer cover .
Removing a Hard Drive
1. Disconnect the power and hard-drive cables from the drive.
IDE/SCSI Drive
Serial ATA Drive
NOTICE: To disconnect a network cable, first unplug the cable from your computer and then unplug it from the network wall jack.
CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover.
NOTICE: Before touching anything inside your computer, ground yourself by touching an unpainted metal surface, such as the metal at the back of the
computer. While you work, periodically touch an unpainted metal surface to dissipate any static electricity that could harm internal components.
1 hard-drive cable
2 power cable