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3. Follow the DC power cables that stem from the power supply and disconnect each connected power cable. 4. Remove the four screws that attach the power supply to the back of the computer chassis. 5. Slide out the power supply and lift it out. 6. Slide the replacement power supply towards the back of the computer. 7. Replace and tighten all screws that secure the power supply to the back of the computer chassis. 8. Reconnect the DC power cables to the system board and drives. 9. Replace the computer cover (see Replacing the Computer Cover). 10. Connect your computer and devices to an electrical outlet, and turn them on. CAUTION: Before working inside your computer, read the safety information that shipped with your computer. For additional safety best practices information, see the Regulatory Compliance Homepage at CAUTION: To guard against likelihood of electric shock, laceration by moving fan blades or other unexpected injuries, always unplug your computer from the electrical outlet before removing the cover. NOTICE: Note the location and ID of each power connector before disconnecting the power supply cables. NOTE: Note the routing of the DC power cables underneath the tabs in the computer chassis as you remove them from the system board and drives. You must route these cables properly when you replace them to prevent them from being pinched or crimped. 1 power supply 2 screws (4) CAUTION: Failure to replace and tighten all screws may cause electrical shock as these screws are a key part of the system grounding. NOTICE: Route the DC power cables under the chassis tabs. The cables must be properly routed to prevent the cables from being damaged. NOTE: Double-check all cable connections to make sure they are secure. Back to Contents Page Back to Contents Page Replacing the System Board Dell™ Inspiron™ 518/519 Service Manual 1. Follow the procedures in Before You Begin. 2. Remove the computer cover (see Removing the Computer Cover). 3. Remove any add-in cards on the system board (see Replacing a PCI/PCI Express Card). 4. Remove the processor and heat sink assembly (see Removing the Processor). 5. Remove the memory modules (see Replacing Memory Module(s)) and document which memory module is removed from each memory socket so that the memory modules can be installed in the same location after the board is replaced. 6. Disconnect all cables from the system board. 7. Remove the eight screws from the system board. 8. Lift the system board up and out. 9. Orient the system board by aligning the screw holes on the system board with the screw holes on the chassis. 10. Replace the eight screws to secure the system board to the chassis. 11. Replace the cables that you removed from the system board. 12. Replace the processor and the heat sink assembly (see Installing the Processor). CAUTION: Before working inside your computer, read the safety information that shipped with your computer. For additional safety best practices information, see the Regulatory Compliance Homepage at NOTICE: Do not perform the following steps unless you are familiar with hardware removal and replacement. Performing these steps incorrectly could damage your system board. For technical service, see the Quick Reference Guide. CAUTION: The processor heat sink can get very hot during normal operation. Be sure that the heat sink has had sufficient time to cool before you touch it. NOTICE: Carefully note the routing and location of each cable before you disconnect it, so that you are sure to re-route cables correctly. An incorrectly routed or a disconnected cable could lead to computer problems. 1 screws (8) 2 system board NOTICE: If you are replacing the system board, visually compare the replacement system board to the existing system board to make sure that you have the correct part. NOTE: Some components and connectors on replacement system boards may be in different locations than corresponding connectors on the existing system board. NOTE: Jumper settings on replacement system boards are preset at the factory. NOTICE: Ensure that the heat sink assembly is correctly seated and secure. 13. Replace the memory modules into the memory sockets at the same locations from which you removed them (see Replacing Memory Module(s)). 14. Replace any add-in cards on the system board. 15. Replace the computer cover (see Replacing the Computer Cover). 16. Connect your computer and devices to an electrical outlet, and turn them on. 17. Flash the system BIOS, as needed. Back to Contents Page NOTE: For information on flashing the system BIOS, see Flashing the BIOS. Back to Contents Page System Setup Dell™ Inspiron™ 518/519 Service Manual Overview Clearing Forgotten Passwords Clearing CMOS Settings Flashing the BIOS Overview Use system setup to: l Change the system configuration information after you add, change, or remove any hardware in your computer l Set or change a user-selectable option...