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While you work, periodically touch an unpainted metal surface to dissipate any static electricity that could harm internal components. 1 tabs (2 on each side) 2 computer 3 computer cover 2. Remove the metal control-panel shield. 3. Remove the screw that holds the control panel to the computer, and remove the control panel. Small Desktop Computer 1. Remove the front I/O panel (see I/O Panel). 2. Using an 8-inch #2 Phillips screwdriver, remove the screw that secures the control panel to the computer, and lift the panel away from the computer. Small Mini-Tower Computer 1. To remove the top and bottom panels of the computer, remove any installed CD drives and release all the tabs on each panel. 1 metal control-panel shield 2 screw 2. To prepare the computer cover for removal, release the three computer cover tabs (one tab is located by the CD drive and two tabs are located by the I/O panel). 3. If necessary, remove the computer cover screw. 4. Close the computer and remove the computer cover. 5. Remove the screw that secures the control panel to the computer, and pull the control panel away from the computer. Replacing the Control Panel Small Form-Factor Computer 1. Replace the control panel and the control-panel shield. 1 computer cover tab (remove the CD drive to access this tab) 4 bottom panel 2 top-panel tabs 5 computer cover screw 3 top panel 6 computer cover tabs (2) NOTE: To release the tab located by the CD drive, you can pry the computer cover away from the computer and pull out the tab. 2. Replace the computer cover. Ensure that the two metal hooks and tabs are securely in position. To help replace the computer cover, remove the accent door and front mask from the computer cover: a. Remove the front mask by releasing the tabs on the inside of the computer cover. b. Remove the accent door by pressing the middle of the door while you lift away the sides of the door. 3. Replace the computer cover and ensure that the two metal hooks and tabs are securely in position. 4. To replace the front mask and accent door, press them into position. Small Desktop Computer 1 accent door 2 front mask 1 metal hooks (2) Follow the steps in the "Removing the Control Panel" procedure in the reverse order, ensuring that all tabs are secure. Small Mini-Tower Computer Follow the steps in the "Removing the Control Panel" procedure in the reverse order, ensuring that all tabs are secure. Back to Contents Page Back to Contents Page Opening the Computer Cover Dell™ OptiPlex™ GX270 Service Manual 1. Shut down the computer through the Start menu. 2. Ensure that your computer and attached devices are turned off. If your computer and attached devices did not automatically turn off when you shut down your computer, turn them off now. 3. Disconnect any telephone or telecommunication lines from the computer. 4. Disconnect your computer and all attached devices from their electrical outlets, and then press the power button to ground the system board. 5. Remove the computer stand, if it is attached. Small Form-Factor and Small Desktop Computers 1. Locate the two release buttons shown in the illustration. Then press the two release buttons as you lift the cover. 2. Raise the back of the cover, and pivot it toward the front of the computer. Small Form-Factor Computer Small Desktop Computer CAUTION: Before you begin any of the procedures in this section, follow the steps in "Safety Instructions." 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: Ensure that there is sufficient space to support the open cover—at least 30 cm (1 ft) of desk top space. NOTICE: Open the cover slowly to ensure that you do not damage any cables. 1 security cable slot 2 padlock ring 3 release buttons (one on each side) Small Mini-Tower Computer 1. Lay the computer on its side as shown in the illustration. 2. Open the cover: a. Facing the back of the computer, press the release button on the right side of the computer with one hand while pulling up on the top of the cover with the other hand. b. Press the release button on the left side of the computer with one hand while pulling up on the top of the cover with the other hand. c. Hold the bottom of the computer with one hand, and then pull open the cover with the other hand. Back to Contents Page 1 security cable slot 2 padlock ring 3 release buttons (one on each side) 1 release buttons (2) 2 security cable slot 3 padlock ring Back to Contents Page Closing the Computer Cover Dell™ OptiPlex™ GX270 Service Manual 1. Ensure that all cables are connected, and fold cables out of the way. Gently pull the power cables toward you so that they do not get caught underneath the drives. 2. Ensure that no tools or extra parts are left inside the computer. 3. Close the cover: a. Pivot the cover down. b. Press down on the ri...