100 Installing System Components5 Replace the heat sink and shroud assembly. See "Replacing the Processor"on page 82.NOTE: To prevent damaging the processor, clean the heat sink to remove anythermal grease and then apply fresh thermal grease to the processor beforeinstalling the heat sink.6 Close the system. See "Closing the System" on page 47.7 Reconnect the system to the electrical outlet, and turn on the system.System Board (Service Only Parts Procedure)CAUTION: Only trained service technicians are authorized to remove the systemcover and access any of the components inside the system. Before performing anyprocedure, see your Product Information Guide for complete information aboutsafety precautions, working inside the computer and protecting againstelectrostatic discharge.CAUTION: The heat sink can get hot during operation. To avoid burns, ensure thatthe system has sufficient time to cool before removing the system board.Removing the System Board1 Turn off the system and attached peripherals, and disconnect the systemfrom the electrical outlet.2 Open the system. See "Opening the System" on page 47.3 Depending on your configuration, disconnect the following cables fromthe system board. See Figure 6-2 for connector locations.• Two power-supply cables from the POWER and POWER12V1connectors• Diskette data cable from the FLOPPY connector• I/O panel cable from the CONTROL-PANEL connector• Processor cooling fan cable from the FAN1 connector• Card cage cooling fan cable from the FAN2 connector• SATA hard-drive data cable(s) from the SATA connector(s)• Intrusion switch cable from the INTRUSION connector
