CAUTION: Before touching anything inside your computer, ground yourself by touching an unpainted metalsurface, such as the metal at the back of the computer. While you work, periodically touch an unpainted metalsurface to dissipate static electricity, which could harm internal components.Turning Off Your ComputerCAUTION: To avoid losing data, save and close all open files and exit all open programs before you turn off yourcomputer.1. Shut down the operating system:– In Windows 7:Click Start , then click Shut Down.– In Windows Vista:Click Start , then click the arrow in the lower-right corner of the Start menu as shown below, and thenclick Shut Down.– In Windows XP:Click Start → Turn Off Computer → Turn Off . The computer turns off after the operating system shutdownprocess is complete.2. Ensure that the computer and all attached devices are turned off. If your computer and attached devices did notautomatically turn off when you shut down your operating system, press and hold the power button for about 6seconds to turn them off.After Working Inside Your ComputerAfter you complete any replacement procedure, ensure you connect any external devices, cards, and cables beforeturning on your computer.1. Replace the cover.CAUTION: To connect a network cable, first plug the cable into the network device and then plug it into thecomputer.2. Connect any telephone or network cables to your computer.3. Connect your computer and all attached devices to their electrical outlets.4. Turn on your computer.5. If required, verify that the computer works correctly by running the Dell Diagnostics.6