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5. Orient the replacement board by aligning the notches on the bottom to the tabs on the computer. 6. Replace the system board: a. If your system board is attached to a metal tray, slide the system board assembly toward the back of the computer until the board clicks into position. b. If you removed a screw in step b in the previous procedure, slide the system board into position and replace the screw. 7. Replace any components and cables that you removed from the system board. 8. Reconnect all cables to their connectors at the back of the computer. 9. Close the computer cover. 10. Attach the computer stand. 11. Connect your computer and devices to electrical outlets, and turn them on. System Board/Metal Tray Assembly Removal System Board Removal CAUTION: The microprocessor package and heat-sink assembly can get hot. To avoid burns, ensure that the package and assembly have had sufficient time to cool before you touch them. NOTE: Some components and connectors on the replacement system board may be in different locations than the corresponding connectors on the existing system board. NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer. Back to Contents Page Back to Contents Page CAUTION: Safety Instructions Dell™ OptiPlex™ GX270 Service Manual General When Working Inside Your Computer Protecting Against Electrostatic Discharge Battery Disposal Use the following safety guidelines to help ensure your own personal safety and to help protect your computer and working environment from potential damage. General l Do not attempt to service the computer yourself unless you are a trained service technician. Always follow installation instructions closely. l To help prevent electric shock, plug the computer and device power cables into properly grounded electrical outlets. These cables are equipped with 3-prong plugs to help ensure proper grounding. Do not use adapter plugs or remove the grounding prong from a cable. If you must use an extension cable, use a 3-wire cable with properly grounded plugs. l To help avoid the potential hazard of electric shock, do not use your computer during an electrical storm. l To help avoid the potential hazard of electric shock, do not connect or disconnect any cables or perform maintenance or reconfiguration of this product during an electrical storm. l If your computer includes a modem, the cable used with the modem should be manufactured with a minimum wire size of 26 American wire gauge (AWG) and an FCC-compliant RJ-11 modular plug. l Before you clean your computer, disconnect the computer from the electrical outlet. Clean your computer with a soft cloth dampened with water. Do not use liquid or aerosol cleaners, which may contain flammable substances. l To help avoid possible damage to the system board, wait 5 seconds after turning off the computer before disconnecting a device from the computer. l To avoid shorting out your computer when disconnecting a network cable, first unplug the cable from the network adapter on the back of your computer, and then from the network jack. When reconnecting a network cable to your computer, first plug the cable into the network jack, and then into the network adapter. l To help protect your computer from sudden, transient increases and decreases in electrical power, use a surge suppressor, line conditioner, or uninterruptible power supply (UPS). l Ensure that nothing rests on your computer's cables and that the cables are not located where they can be stepped on or tripped over. l Do not push any objects into the openings of your computer. Doing so can cause fire or electric shock by shorting out interior components. l Keep your computer away from radiators and heat sources. Also, do not block cooling vents. Avoid placing loose papers underneath your computer; do not place your computer in a closed-in wall unit or on a bed, sofa, or rug. When Using Your Computer When Working Inside Your Computer Before you open the computer cover, perform the following steps in the sequence indicated. 1. Perform an orderly computer shutdown using the operating system menu. CAUTION: Do not attempt to service the computer yourself, except as explained in your online Dell™ documentation or in instructions otherwise provided to you by Dell. Always follow installation and service instructions closely. NOTICE: To help avoid possible damage to the system board, wait 5 seconds after turning off the computer before removing a component from the system board or disconnecting a device from the computer. Back to Contents Page 2. Turn off your computer and any devices connected to the computer. 3. Ground yourself by touching an unpainted metal surface on the chassis before touching anything inside your computer. While you work, periodically touch an unpainted metal surface on the computer chassis to dissipate any static electricity that might harm internal components. 4. Disconnect your computer and devic...