3. Disconnect all network cables from the computer.4. Disconnect your computer and all attached devices from their electrical outlets.5. Press and hold the power button while the computer is unplugged to ground the system board.6. Remove the cover.CAUTION: Before touching anything inside your computer, ground yourself by touching anunpainted metal surface, such as the metal at the back of the computer. While you work,periodically touch an unpainted metal surface to dissipate static electricity, which couldharm internal components.Turning Off Your ComputerCAUTION: To avoid losing data, save and close all open files and exit all open programs beforeyou turn off your computer.1. Turning off your computer (Windows 8.1):• Using a touch enabled device:a. Swipe in from the right edge of the screen, opening the Charms menu and select Settings.b. Select and then select Shut down.ora. On the Home screen, touch and then select Shut down.• Using a mouse:a. Point to upper-right corner of the screen and click Settings.b. Click and then select Shut down.ora. On the Home screen, click and then select Shut down.2. Turning off your computer (Windows 7):a. Click Start .b. Click Shut Down.ora. Click Start .b. Click the arrow in the lower-right corner of the Start menu, and then click Log off.3. Ensure that the computer and all attached devices are turned off. If your computer and attacheddevices did not automatically turn off when you shut down your operating system, press and holdthe power button for about 6 seconds to turn them off.After working inside your computerAfter you complete any replacement procedure, ensure that you connect any external devices, cards, andcables before turning on your computer.1. Replace the cover.6