Dell Precision T5400 User's Guide - Page 285
Replace the heat sink assembly and tighten the four captive screws
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CAUTION: The processor 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. b Remove the processor from the existing system board and transfer the processor to the replacement system board. See "Processor" on page 179 for more information. 2 Set the jumpers on the replacement system board so that they are identical to the ones on the existing board (see "System Board Components" on page 28.) NOTE: Some components and connectors on the replacement system board may be in different locations than the corresponding connectors on the existing system board. 3 Orient the replacement board by aligning the screw holes in the board with the corresponding holes in the computer chassis. 4 Screw in the 9 screws that attach the system board. 5 Replace the heat sink assembly and tighten the four captive screws to secure it to the system board. 6 Replace any components and cables that you removed from the system board. 7 Reconnect all cables to their connectors at the back of the computer. 8 Replace the computer cover (see "Replacing the Computer Cover" on page 161). NOTICE: To connect a network cable, first plug the cable into the network port or device and then plug it into the computer. 9 Connect your computer and devices to electrical outlets, and turn them on. Adding and Replacing Parts 285