Dell Precision 450 - Manual (Page 118)

6. Open the computer cover .
7. Ground yourself by touching an unpainted metal surface on the computer, such as the metal at the back of the computer, before touching anything
inside your computer.
While you work, periodically touch an unpainted metal surface on the computer to dissipate any static electricity that might harm internal components.
Removing a CD/DVD Drive
1. Disconnect the power and CD/DVD drive cables from the back of the drive.
2. Press inward on the two tabs on the sides of the drive, and then slide the drive upward and remove it from the drive bay.
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 power cable
2 CD/DVD drive cable