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NOTE: Your replacement board may or may not be attached to a metal tray. If your original system board was attached to a tray, you will transfer the replacement board to the metal tray before you install the new board. See step 1 in the next procedure. 10. Remove the system board: a. If your system board is attached to a metal tray, the board and the tray are connected and are removed as one piece. Pull up on the tab and slide the system board assembly toward the front of the computer, and then lift the board up and away. b. If your system board is secured to the computer with a screw, remove the screw and slide the system board toward the front of the computer, detaching it from the hooks on the floor of the chassis, and then lift the board up and away. 11. Place the system board assembly that you just removed next to the replacement system board. Replacing the System Board 1. If your original system board was attached to a metal tray and your replacement system board is not attached to a tray, attach the replacement board to the metal tray: a. Remove the screw that secures the original board to the metal tray, and then remove the system board by sliding the board back and detaching it from the hooks on the metal tray. b. Set the replacement system board on the metal tray, slide it forward to attach the board to the hooks on the metal tray, and then replace the screw. 2. Transfer components from the existing system board to the replacement system board: a. Remove the memory modules and install them on the replacement board. b. Remove the heat-sink assembly and microprocessor from the existing system board and transfer them to the replacement system board. 3. Configure the settings of the replacement system board. 4. Set the jumpers on the replacement system board so they are identical to the ones on the existing board. 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 ...