Dell Precision T7400 User's Guide - Page 169

Replacing the Power Supply 1 Slide the power supply into place. 2 Replace the four screws that secure the power supply to the back of the computer chassis. 3 Reconnect the DC power cables. 4 On the computer, reattach the power cables to the side of the hard drive. 5 Run the cables underneath the tabs, and press the tabs to close them over the cables. 6 Replace the computer cover (see "Replacing the Computer Cover" on page 145). NOTICE: To connect a network cable, first plug the cable into the network port or device and then plug it into the computer. 7 Connect your computer and devices to electrical outlets, and turn them on. Battery 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. CAUTION: A new battery can explode if it is incorrectly installed. Replace the battery only with the same or equivalent type recommended by the manufacturer. Discard used batteries according to the manufacturer's instructions. NOTICE: To prevent static damage to components inside your computer, discharge static electricity from your body before you touch any of your computer's electronic components. You can do so by touching an unpainted metal surface on the computer. About the Battery A coin-cell battery maintains computer configuration, date, and time information. The battery can last several years. Adding and Replacing Parts 169